From 67d4e399c274e4123b4ba7ac90fe9438994d803e Mon Sep 17 00:00:00 2001
From: Marios Trivyzas <matriv@gmail.com>
Date: Mon, 22 Apr 2019 19:26:15 +0300
Subject: [PATCH] SQL: Implement CASE... WHEN... THEN... ELSE... END (#41349)

Implement the ANSI SQL CASE expression which provides the if/else
functionality common to most programming languages.

The CASE expression can have multiple WHEN branches and becomes a
powerful tool for SQL queries as it can be used in SELECT, WHERE,
GROUP BY, HAVING and ORDER BY clauses.

Closes: #36200
(cherry picked from commit 8b2577406f47ae60d15803058921d128390af0b6)
---
 .../sql/functions/conditional.asciidoc        |   95 +-
 docs/reference/sql/functions/index.asciidoc   |    1 +
 .../qa/src/main/resources/command.csv-spec    |    1 +
 .../src/main/resources/conditionals.csv-spec  |  181 ++
 .../qa/src/main/resources/docs/docs.csv-spec  |   74 +-
 .../sql/qa/src/main/resources/null.csv-spec   |   36 -
 .../sql/qa/src/main/resources/null.sql-spec   |   17 +-
 x-pack/plugin/sql/src/main/antlr/SqlBase.g4   |   30 +-
 .../plugin/sql/src/main/antlr/SqlBase.tokens  |  446 ++--
 .../sql/src/main/antlr/SqlBaseLexer.tokens    |  444 ++--
 .../expression/function/FunctionRegistry.java |    4 +-
 .../function/scalar/Processors.java           |    4 +-
 .../whitelist/InternalSqlScriptUtils.java     |    7 +-
 .../predicate/conditional/Case.java           |  164 ++
 .../predicate/conditional/CasePipe.java       |   38 +
 .../predicate/conditional/CaseProcessor.java  |   77 +
 .../conditional/ConditionalFunction.java      |   18 +
 .../predicate/conditional/IfConditional.java  |   92 +
 .../xpack/sql/optimizer/Optimizer.java        |   37 +
 .../xpack/sql/parser/ExpressionBuilder.java   |   22 +
 .../xpack/sql/parser/SqlBaseBaseListener.java |   24 +
 .../xpack/sql/parser/SqlBaseBaseVisitor.java  |   14 +
 .../xpack/sql/parser/SqlBaseLexer.java        |  859 ++++----
 .../xpack/sql/parser/SqlBaseListener.java     |   22 +
 .../xpack/sql/parser/SqlBaseParser.java       | 1907 +++++++++--------
 .../xpack/sql/parser/SqlBaseVisitor.java      |   13 +
 .../xpack/sql/plugin/sql_whitelist.txt        |    3 +-
 .../analyzer/VerifierErrorMessagesTests.java  |   20 +
 .../predicate/conditional/CaseTests.java      |  100 +
 .../xpack/sql/optimizer/OptimizerTests.java   |   94 +-
 .../xpack/sql/parser/ExpressionTests.java     |   62 +
 .../sql/planner/QueryTranslatorTests.java     |   15 +
 .../xpack/sql/tree/NodeSubclassTests.java     |    6 +-
 33 files changed, 3136 insertions(+), 1791 deletions(-)
 create mode 100644 x-pack/plugin/sql/qa/src/main/resources/conditionals.csv-spec
 create mode 100644 x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/Case.java
 create mode 100644 x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CasePipe.java
 create mode 100644 x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseProcessor.java
 create mode 100644 x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/IfConditional.java
 create mode 100644 x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseTests.java

diff --git a/docs/reference/sql/functions/conditional.asciidoc b/docs/reference/sql/functions/conditional.asciidoc
index 135381a1c93..cf15504bbe3 100644
--- a/docs/reference/sql/functions/conditional.asciidoc
+++ b/docs/reference/sql/functions/conditional.asciidoc
@@ -1,10 +1,103 @@
 [role="xpack"]
 [testenv="basic"]
 [[sql-functions-conditional]]
-=== Conditional Functions
+=== Conditional Functions And Expressions
 
 Functions that return one of their arguments by evaluating in an if-else manner.
 
+[[sql-functions-conditional-case]]
+==== `CASE`
+
+.Synopsis:
+[source, sql]
+----
+CASE WHEN condition THEN result
+    [WHEN ...]
+    [ELSE default_result]
+END
+----
+
+*Input*:
+
+One or multiple _WHEN *condition* THEN *result_* clauses are used and the expression can optionally have
+an _ELSE *default_result_* clause. Every *condition* should be a boolean expression.
+
+*Output*: one of the *result* expressions if the corresponding _WHEN *condition_* evaluates to `true` or
+the *default_result* if all _WHEN *condition_* clauses evaluate to `false`. If the optional _ELSE *default_result_*
+clause is missing and all _WHEN *condition_* clauses evaluate to `false` then `null` is returned.
+
+.Description
+
+The CASE expression is a generic conditional expression which simulates if/else statements of other programming languages
+If the condition’s result is true, the value of the result expression that follows the condition will be the returned
+the subsequent when clauses will be skipped and not processed.
+
+
+["source","sql",subs="attributes,callouts,macros"]
+----
+include-tagged::{sql-specs}/docs/docs.csv-spec[case]
+----
+
+["source","sql",subs="attributes,callouts,macros"]
+----
+include-tagged::{sql-specs}/docs/docs.csv-spec[caseReturnNull]
+----
+
+["source","sql",subs="attributes,callouts,macros"]
+----
+include-tagged::{sql-specs}/docs/docs.csv-spec[caseWithElse]
+----
+
+
+As a variant, a case expression can be expressed with a syntax similar to *switch-case* of other programming languages:
+[source, sql]
+----
+CASE expression
+     WHEN value1 THEN result1
+    [WHEN value2 THEN result2]
+    [WHEN ...]
+    [ELSE default_result]
+END
+----
+
+In this case it's transformed internally to:
+[source, sql]
+----
+CASE WHEN expression = value1 THEN result1
+    [WHEN expression = value2 THEN result2]
+    [WHEN ...]
+    [ELSE default_result]
+END
+----
+
+["source","sql",subs="attributes,callouts,macros"]
+----
+include-tagged::{sql-specs}/docs/docs.csv-spec[caseWithOperand]
+----
+
+["source","sql",subs="attributes,callouts,macros"]
+----
+include-tagged::{sql-specs}/docs/docs.csv-spec[caseWithOperandAndElse]
+----
+
+[NOTE]
+===============================
+All result expressions must be of compatible data types. More specifically all result
+expressions should have a compatible data type with the 1st _non-null_ result expression.
+E.g.:
+
+for the following query:
+
+[source, sql]
+CASE WHEN a = 1 THEN null
+     WHEN a > 2 THEN 10
+     WHEN a > 5 THEN 'foo'
+END
+
+an error message would be returned, mentioning that *'foo'* is of data type *keyword*,
+which does not match the expected data type *integer* (based on result *10*).
+===============================
+
 [[sql-functions-conditional-coalesce]]
 ==== `COALESCE`
 
diff --git a/docs/reference/sql/functions/index.asciidoc b/docs/reference/sql/functions/index.asciidoc
index 1fa2778ee05..831a9d0a4e7 100644
--- a/docs/reference/sql/functions/index.asciidoc
+++ b/docs/reference/sql/functions/index.asciidoc
@@ -127,6 +127,7 @@
 ** <<sql-functions-type-conversion-cast>>
 ** <<sql-functions-type-conversion-convert>>
 * <<sql-functions-conditional>>
+** <<sql-functions-conditional-case>>
 ** <<sql-functions-conditional-coalesce>>
 ** <<sql-functions-conditional-greatest>>
 ** <<sql-functions-conditional-ifnull>>
diff --git a/x-pack/plugin/sql/qa/src/main/resources/command.csv-spec b/x-pack/plugin/sql/qa/src/main/resources/command.csv-spec
index ea7cfb2c6a2..73ef70a96a4 100644
--- a/x-pack/plugin/sql/qa/src/main/resources/command.csv-spec
+++ b/x-pack/plugin/sql/qa/src/main/resources/command.csv-spec
@@ -25,6 +25,7 @@ STDDEV_POP       |AGGREGATE
 SUM_OF_SQUARES   |AGGREGATE      
 VAR_POP          |AGGREGATE      
 HISTOGRAM        |GROUPING        
+CASE             |CONDITIONAL
 COALESCE         |CONDITIONAL
 GREATEST         |CONDITIONAL
 IFNULL           |CONDITIONAL
diff --git a/x-pack/plugin/sql/qa/src/main/resources/conditionals.csv-spec b/x-pack/plugin/sql/qa/src/main/resources/conditionals.csv-spec
new file mode 100644
index 00000000000..2a4eaa501a1
--- /dev/null
+++ b/x-pack/plugin/sql/qa/src/main/resources/conditionals.csv-spec
@@ -0,0 +1,181 @@
+caseField
+SELECT emp_no, CASE WHEN emp_no - 10000 < 10 THEN 'First 10' ELSE 'Second 10' END as "case" FROM test_emp WHERE emp_no >= 10005
+ORDER BY emp_no LIMIT 10;
+
+ emp_no |   case
+--------+-----------
+10005   | First 10
+10006   | First 10
+10007   | First 10
+10008   | First 10
+10009   | First 10
+10010   | Second 10
+10011   | Second 10
+10012   | Second 10
+10013   | Second 10
+10014   | Second 10
+;
+
+caseFieldWithoutAlias
+SELECT emp_no, CASE WHEN emp_no - 10000 < 10 THEN emp_no ELSE emp_no % 10 END FROM test_emp WHERE emp_no >= 10005
+ORDER BY emp_no LIMIT 10;
+
+ emp_no | CASE WHEN emp_no - 10000 < 10 THEN emp_no ELSE emp_no % 10 END
+--------+----------------------------------------------------------------
+10005   | 10005
+10006   | 10006
+10007   | 10007
+10008   | 10008
+10009   | 10009
+10010   | 0
+10011   | 1
+10012   | 2
+10013   | 3
+10014   | 4
+;
+
+caseFieldNoElse
+SELECT emp_no, CASE WHEN emp_no - 10000 < 10 THEN 'First 10' END as "case" FROM test_emp WHERE emp_no >= 10005
+ORDER BY emp_no LIMIT 10;
+
+ emp_no |   case
+--------+----------
+10005   | First 10
+10006   | First 10
+10007   | First 10
+10008   | First 10
+10009   | First 10
+10010   | null
+10011   | null
+10012   | null
+10013   | null
+10014   | null
+;
+
+caseWhere
+SELECT last_name FROM test_emp WHERE CASE WHEN LENGTH(last_name) < 7 THEN 'ShortName' ELSE 'LongName' END = 'LongName'
+ORDER BY emp_no LIMIT 10;
+
+ last_name
+-----------
+Facello
+Bamford
+Koblick
+Maliniak
+Preusig
+Zielinski
+Kalloufi
+Piveteau
+Bridgland
+Nooteboom
+;
+
+caseWhereNoElse
+SELECT last_name FROM test_emp WHERE CASE WHEN LENGTH(last_name) < 7 THEN 'ShortName' END IS NOT NULL
+ORDER BY emp_no LIMIT 10;
+
+ last_name
+-----------
+Simmel
+Peac
+Sluis
+Terkki
+Genin
+Peha
+Erde
+Famili
+Pettey
+Heyers
+;
+
+caseOrderBy
+schema::last_name:s|languages:byte|emp_no:i
+SELECT last_name, languages, emp_no FROM test_emp WHERE emp_no BETWEEN 10005 AND 10015
+ORDER BY CASE WHEN languages >= 3 THEN 'first' ELSE 'second' END, emp_no LIMIT 10;
+
+ last_name | languages | emp_no
+-----------+-----------+--------
+ Preusig   | 3         | 10006
+ Zielinski | 4         | 10007
+ Piveteau  | 4         | 10010
+ Sluis     | 5         | 10011
+ Bridgland | 5         | 10012
+ Genin     | 5         | 10014
+ Nooteboom | 5         | 10015
+ Maliniak  | 1         | 10005
+ Kalloufi  | 2         | 10008
+ Peac      | 1         | 10009
+;
+
+caseOrderByNoElse
+schema::last_name:s|languages:byte|emp_no:i
+SELECT last_name, languages, emp_no FROM test_emp WHERE emp_no BETWEEN 10005 AND 10015
+ORDER BY CASE WHEN languages >= 3 THEN 'first' END NULLS FIRST, emp_no LIMIT 10;
+
+ last_name | languages | emp_no
+-----------+-----------+--------
+Maliniak   | 1         | 10005
+Kalloufi   | 2         | 10008
+Peac       | 1         | 10009
+Terkki     | 1         | 10013
+Preusig    | 3         | 10006
+Zielinski  | 4         | 10007
+Piveteau   | 4         | 10010
+Sluis      | 5         | 10011
+Bridgland  | 5         | 10012
+Genin      | 5         | 10014
+;
+
+caseGroupBy
+schema::count:l|lang_skills:s
+SELECT count(*) AS count, CASE WHEN NVL(languages, 0) <= 1  THEN 'zero-to-one' ELSE 'multilingual' END as lang_skills
+FROM test_emp GROUP BY lang_skills ORDER BY lang_skills;
+
+ count | lang_skills
+-------+--------------
+75     | multilingual
+25     | zero-to-one
+;
+
+caseGroupByNoElse
+schema::count:l|lang_skills:s
+SELECT count(*) AS count, CASE WHEN NVL(languages, 0) <= 1  THEN 'zero-to-one' END as lang_skills
+FROM test_emp GROUP BY lang_skills ORDER BY lang_skills;
+
+ count | lang_skills
+-------+-------------
+75     | null
+25     | zero-to-one
+;
+
+caseGroupByComplexNested
+schema::count:l|lang_skills:s
+SELECT count(*) AS count,
+CASE WHEN NVL(languages, 0) = 0 THEN 'zero'
+     WHEN languages = 1 THEN 'one'
+     WHEN languages = 2 THEN 'bilingual'
+     WHEN languages = 3 THEN 'trilingual'
+     ELSE 'multilingual'
+END as lang_skills FROM test_emp GROUP BY lang_skills ORDER BY 2;
+
+ count | lang_skills
+-------+--------------
+19     | bilingual
+39     | multilingual
+15     | one
+17     | trilingual
+10     | zero
+;
+
+caseGroupByAndHaving
+schema::count:l|gender:s|languages:byte
+SELECT count(*) AS count, gender, languages FROM test_emp
+GROUP BY 2, 3 HAVING CASE WHEN count(*) > 10 THEN 'many' ELSE 'a few' END = 'many'
+ORDER BY 2, 3;
+
+count     |    gender   |   languages
+----------+-------------+---------------
+11        | M           | 2
+11        | M           | 3
+11        | M           | 4
+;
diff --git a/x-pack/plugin/sql/qa/src/main/resources/docs/docs.csv-spec b/x-pack/plugin/sql/qa/src/main/resources/docs/docs.csv-spec
index d7a60200a5e..bc7180de4d6 100644
--- a/x-pack/plugin/sql/qa/src/main/resources/docs/docs.csv-spec
+++ b/x-pack/plugin/sql/qa/src/main/resources/docs/docs.csv-spec
@@ -202,6 +202,7 @@ STDDEV_POP       |AGGREGATE
 SUM_OF_SQUARES   |AGGREGATE      
 VAR_POP          |AGGREGATE      
 HISTOGRAM        |GROUPING
+CASE             |CONDITIONAL
 COALESCE         |CONDITIONAL
 GREATEST         |CONDITIONAL
 IFNULL           |CONDITIONAL
@@ -1987,10 +1988,81 @@ SELECT TRUNCATE(-345.153, 1) AS trimmed;
 
 ///////////////////////////////
 //
-// Null handling
+// Conditional
 //
 ///////////////////////////////
 
+case
+schema::case:s
+// tag::case
+SELECT CASE WHEN 1 > 2 THEN 'elastic'
+            WHEN 2 <= 3 THEN 'search'
+       END AS "case";
+
+    case
+---------------
+search
+// end::case
+;
+
+caseReturnNull
+schema::case:s
+// tag::caseReturnNull
+SELECT CASE WHEN 1 > 2 THEN 'elastic'
+            WHEN 2 > 10 THEN 'search'
+       END AS "case";
+
+    case
+---------------
+null
+// end::caseReturnNull
+;
+
+caseWithElse
+schema::case:s
+// tag::caseWithElse
+SELECT CASE WHEN 1 > 2 THEN 'elastic'
+            WHEN 2 > 10 THEN 'search'
+            ELSE 'default'
+       END AS "case";
+
+    case
+---------------
+default
+// end::caseWithElse
+;
+
+caseWithOperand
+schema::case:s
+// tag::caseWithOperand
+SELECT CASE 5
+            WHEN 1 THEN 'elastic'
+            WHEN 2 THEN 'search'
+            WHEN 5 THEN 'elasticsearch'
+       END AS "case";
+
+    case
+---------------
+elasticsearch
+// end::caseWithOperand
+;
+
+caseWithOperandAndElse
+schema::case:s
+// tag::caseWithOperandAndElse
+SELECT CASE 5
+            WHEN 1 THEN 'elastic'
+            WHEN 2 THEN 'search'
+            WHEN 3 THEN 'elasticsearch'
+            ELSE 'default'
+       END AS "case";
+
+    case
+---------------
+default
+// end::caseWithOperandAndElse
+;
+
 coalesceReturnNonNull
 // tag::coalesceReturnNonNull
 SELECT COALESCE(null, 'elastic', 'search') AS "coalesce";
diff --git a/x-pack/plugin/sql/qa/src/main/resources/null.csv-spec b/x-pack/plugin/sql/qa/src/main/resources/null.csv-spec
index 610217b2333..df76250694e 100644
--- a/x-pack/plugin/sql/qa/src/main/resources/null.csv-spec
+++ b/x-pack/plugin/sql/qa/src/main/resources/null.csv-spec
@@ -38,45 +38,9 @@ c
 null
 ;
 
-coalesceFirstNotNull
-SELECT COALESCE(123) AS c;
-
-c
-123
-;
-
-
-coalesceWithFirstNullOfString
-SELECT COALESCE(null, 'first') AS c;
-
-c:s
-first
-;
-
-coalesceWithFirstNullOfNumber
-SELECT COALESCE(null, 123) AS c;
-
-c:i
-123
-;
-
 coalesceMixed
 SELECT COALESCE(null, 123, null, 321);
 
 COALESCE(null, 123, null, 321):i
 123
 ;
-
-coalesceMixedWithAlias
-SELECT COALESCE(null, 123, null, 321) AS c;
-
-c:i
-123
-;
-
-coalesceScalar
-SELECT COALESCE(null, ABS(123) + 1) AS c;
-
-c:i
-124
-;
diff --git a/x-pack/plugin/sql/qa/src/main/resources/null.sql-spec b/x-pack/plugin/sql/qa/src/main/resources/null.sql-spec
index d5a21262ca5..fce74d7569e 100644
--- a/x-pack/plugin/sql/qa/src/main/resources/null.sql-spec
+++ b/x-pack/plugin/sql/qa/src/main/resources/null.sql-spec
@@ -1,7 +1,22 @@
 //
-// Null expressions
+// Null conditionals
 //
 
+coalesceFirstNotNull
+SELECT COALESCE(123) AS c;
+
+coalesceWithFirstNullOfString
+SELECT COALESCE(null, 'first') AS c;
+
+coalesceWithFirstNullOfNumber
+SELECT COALESCE(null, 123) AS c;
+
+coalesceMixedWithAlias
+SELECT COALESCE(null, 123, null, 321) AS c;
+
+coalesceScalar
+SELECT COALESCE(null, ABS(123) + 1) AS c;
+
 coalesceField
 SELECT COALESCE(null, ABS(emp_no) + 1) AS c FROM test_emp ORDER BY emp_no LIMIT 5;
 
diff --git a/x-pack/plugin/sql/src/main/antlr/SqlBase.g4 b/x-pack/plugin/sql/src/main/antlr/SqlBase.g4
index d814e9e60f2..f60610fc751 100644
--- a/x-pack/plugin/sql/src/main/antlr/SqlBase.g4
+++ b/x-pack/plugin/sql/src/main/antlr/SqlBase.g4
@@ -213,16 +213,17 @@ valueExpression
     ;
 
 primaryExpression
-    : castExpression                                                                 #cast
-    | primaryExpression CAST_OP dataType                                             #castOperatorExpression
-    | extractExpression                                                              #extract
-    | builtinDateTimeFunction                                                        #currentDateTimeFunction
-    | constant                                                                       #constantDefault
-    | (qualifiedName DOT)? ASTERISK                                                  #star
-    | functionExpression                                                             #function
-    | '(' query ')'                                                                  #subqueryExpression
-    | qualifiedName                                                                  #dereference
-    | '(' expression ')'                                                             #parenthesizedExpression
+    : castExpression                                                                           #cast
+    | primaryExpression CAST_OP dataType                                                       #castOperatorExpression
+    | extractExpression                                                                        #extract
+    | builtinDateTimeFunction                                                                  #currentDateTimeFunction
+    | constant                                                                                 #constantDefault
+    | (qualifiedName DOT)? ASTERISK                                                            #star
+    | functionExpression                                                                       #function
+    | '(' query ')'                                                                            #subqueryExpression
+    | qualifiedName                                                                            #dereference
+    | '(' expression ')'                                                                       #parenthesizedExpression
+    | CASE (operand=booleanExpression)? whenClause+ (ELSE elseClause=booleanExpression)? END   #case
     ;
 
 builtinDateTimeFunction
@@ -337,6 +338,10 @@ string
     | STRING
     ;
 
+whenClause
+    : WHEN condition=expression THEN result=expression
+    ;
+
 // http://developer.mimer.se/validator/sql-reserved-words.tml
 nonReserved
     : ANALYZE | ANALYZED 
@@ -368,6 +373,7 @@ AS: 'AS';
 ASC: 'ASC';
 BETWEEN: 'BETWEEN';
 BY: 'BY';
+CASE: 'CASE';
 CAST: 'CAST';
 CATALOG: 'CATALOG';
 CATALOGS: 'CATALOGS';
@@ -382,6 +388,8 @@ DEBUG: 'DEBUG';
 DESC: 'DESC';
 DESCRIBE: 'DESCRIBE';
 DISTINCT: 'DISTINCT';
+ELSE: 'ELSE';
+END: 'END';
 ESCAPE: 'ESCAPE';
 EXECUTABLE: 'EXECUTABLE';
 EXISTS: 'EXISTS';
@@ -437,12 +445,14 @@ SYS: 'SYS';
 TABLE: 'TABLE';
 TABLES: 'TABLES';
 TEXT: 'TEXT';
+THEN: 'THEN';
 TRUE: 'TRUE';
 TO: 'TO';
 TYPE: 'TYPE';
 TYPES: 'TYPES';
 USING: 'USING';
 VERIFY: 'VERIFY';
+WHEN: 'WHEN';
 WHERE: 'WHERE';
 WITH: 'WITH';
 YEAR: 'YEAR';
diff --git a/x-pack/plugin/sql/src/main/antlr/SqlBase.tokens b/x-pack/plugin/sql/src/main/antlr/SqlBase.tokens
index 71b981ebfa3..0b24423bbee 100644
--- a/x-pack/plugin/sql/src/main/antlr/SqlBase.tokens
+++ b/x-pack/plugin/sql/src/main/antlr/SqlBase.tokens
@@ -11,122 +11,127 @@ AS=10
 ASC=11
 BETWEEN=12
 BY=13
-CAST=14
-CATALOG=15
-CATALOGS=16
-COLUMNS=17
-CONVERT=18
-CURRENT_DATE=19
-CURRENT_TIME=20
-CURRENT_TIMESTAMP=21
-DAY=22
-DAYS=23
-DEBUG=24
-DESC=25
-DESCRIBE=26
-DISTINCT=27
-ESCAPE=28
-EXECUTABLE=29
-EXISTS=30
-EXPLAIN=31
-EXTRACT=32
-FALSE=33
-FIRST=34
-FORMAT=35
-FROM=36
-FULL=37
-FUNCTIONS=38
-GRAPHVIZ=39
-GROUP=40
-HAVING=41
-HOUR=42
-HOURS=43
-IN=44
-INNER=45
-INTERVAL=46
-IS=47
-JOIN=48
-LAST=49
-LEFT=50
-LIKE=51
-LIMIT=52
-MAPPED=53
-MATCH=54
-MINUTE=55
-MINUTES=56
-MONTH=57
-MONTHS=58
-NATURAL=59
-NOT=60
-NULL=61
-NULLS=62
-ON=63
-OPTIMIZED=64
-OR=65
-ORDER=66
-OUTER=67
-PARSED=68
-PHYSICAL=69
-PLAN=70
-RIGHT=71
-RLIKE=72
-QUERY=73
-SCHEMAS=74
-SECOND=75
-SECONDS=76
-SELECT=77
-SHOW=78
-SYS=79
-TABLE=80
-TABLES=81
-TEXT=82
-TRUE=83
-TO=84
-TYPE=85
-TYPES=86
-USING=87
-VERIFY=88
-WHERE=89
-WITH=90
-YEAR=91
-YEARS=92
-ESCAPE_ESC=93
-FUNCTION_ESC=94
-LIMIT_ESC=95
-DATE_ESC=96
-TIME_ESC=97
-TIMESTAMP_ESC=98
-GUID_ESC=99
-ESC_END=100
-EQ=101
-NULLEQ=102
-NEQ=103
-LT=104
-LTE=105
-GT=106
-GTE=107
-PLUS=108
-MINUS=109
-ASTERISK=110
-SLASH=111
-PERCENT=112
-CAST_OP=113
-CONCAT=114
-DOT=115
-PARAM=116
-STRING=117
-INTEGER_VALUE=118
-DECIMAL_VALUE=119
-IDENTIFIER=120
-DIGIT_IDENTIFIER=121
-TABLE_IDENTIFIER=122
-QUOTED_IDENTIFIER=123
-BACKQUOTED_IDENTIFIER=124
-SIMPLE_COMMENT=125
-BRACKETED_COMMENT=126
-WS=127
-UNRECOGNIZED=128
-DELIMITER=129
+CASE=14
+CAST=15
+CATALOG=16
+CATALOGS=17
+COLUMNS=18
+CONVERT=19
+CURRENT_DATE=20
+CURRENT_TIME=21
+CURRENT_TIMESTAMP=22
+DAY=23
+DAYS=24
+DEBUG=25
+DESC=26
+DESCRIBE=27
+DISTINCT=28
+ELSE=29
+END=30
+ESCAPE=31
+EXECUTABLE=32
+EXISTS=33
+EXPLAIN=34
+EXTRACT=35
+FALSE=36
+FIRST=37
+FORMAT=38
+FROM=39
+FULL=40
+FUNCTIONS=41
+GRAPHVIZ=42
+GROUP=43
+HAVING=44
+HOUR=45
+HOURS=46
+IN=47
+INNER=48
+INTERVAL=49
+IS=50
+JOIN=51
+LAST=52
+LEFT=53
+LIKE=54
+LIMIT=55
+MAPPED=56
+MATCH=57
+MINUTE=58
+MINUTES=59
+MONTH=60
+MONTHS=61
+NATURAL=62
+NOT=63
+NULL=64
+NULLS=65
+ON=66
+OPTIMIZED=67
+OR=68
+ORDER=69
+OUTER=70
+PARSED=71
+PHYSICAL=72
+PLAN=73
+RIGHT=74
+RLIKE=75
+QUERY=76
+SCHEMAS=77
+SECOND=78
+SECONDS=79
+SELECT=80
+SHOW=81
+SYS=82
+TABLE=83
+TABLES=84
+TEXT=85
+THEN=86
+TRUE=87
+TO=88
+TYPE=89
+TYPES=90
+USING=91
+VERIFY=92
+WHEN=93
+WHERE=94
+WITH=95
+YEAR=96
+YEARS=97
+ESCAPE_ESC=98
+FUNCTION_ESC=99
+LIMIT_ESC=100
+DATE_ESC=101
+TIME_ESC=102
+TIMESTAMP_ESC=103
+GUID_ESC=104
+ESC_END=105
+EQ=106
+NULLEQ=107
+NEQ=108
+LT=109
+LTE=110
+GT=111
+GTE=112
+PLUS=113
+MINUS=114
+ASTERISK=115
+SLASH=116
+PERCENT=117
+CAST_OP=118
+CONCAT=119
+DOT=120
+PARAM=121
+STRING=122
+INTEGER_VALUE=123
+DECIMAL_VALUE=124
+IDENTIFIER=125
+DIGIT_IDENTIFIER=126
+TABLE_IDENTIFIER=127
+QUOTED_IDENTIFIER=128
+BACKQUOTED_IDENTIFIER=129
+SIMPLE_COMMENT=130
+BRACKETED_COMMENT=131
+WS=132
+UNRECOGNIZED=133
+DELIMITER=134
 '('=1
 ')'=2
 ','=3
@@ -140,105 +145,110 @@ DELIMITER=129
 'ASC'=11
 'BETWEEN'=12
 'BY'=13
-'CAST'=14
-'CATALOG'=15
-'CATALOGS'=16
-'COLUMNS'=17
-'CONVERT'=18
-'CURRENT_DATE'=19
-'CURRENT_TIME'=20
-'CURRENT_TIMESTAMP'=21
-'DAY'=22
-'DAYS'=23
-'DEBUG'=24
-'DESC'=25
-'DESCRIBE'=26
-'DISTINCT'=27
-'ESCAPE'=28
-'EXECUTABLE'=29
-'EXISTS'=30
-'EXPLAIN'=31
-'EXTRACT'=32
-'FALSE'=33
-'FIRST'=34
-'FORMAT'=35
-'FROM'=36
-'FULL'=37
-'FUNCTIONS'=38
-'GRAPHVIZ'=39
-'GROUP'=40
-'HAVING'=41
-'HOUR'=42
-'HOURS'=43
-'IN'=44
-'INNER'=45
-'INTERVAL'=46
-'IS'=47
-'JOIN'=48
-'LAST'=49
-'LEFT'=50
-'LIKE'=51
-'LIMIT'=52
-'MAPPED'=53
-'MATCH'=54
-'MINUTE'=55
-'MINUTES'=56
-'MONTH'=57
-'MONTHS'=58
-'NATURAL'=59
-'NOT'=60
-'NULL'=61
-'NULLS'=62
-'ON'=63
-'OPTIMIZED'=64
-'OR'=65
-'ORDER'=66
-'OUTER'=67
-'PARSED'=68
-'PHYSICAL'=69
-'PLAN'=70
-'RIGHT'=71
-'RLIKE'=72
-'QUERY'=73
-'SCHEMAS'=74
-'SECOND'=75
-'SECONDS'=76
-'SELECT'=77
-'SHOW'=78
-'SYS'=79
-'TABLE'=80
-'TABLES'=81
-'TEXT'=82
-'TRUE'=83
-'TO'=84
-'TYPE'=85
-'TYPES'=86
-'USING'=87
-'VERIFY'=88
-'WHERE'=89
-'WITH'=90
-'YEAR'=91
-'YEARS'=92
-'{ESCAPE'=93
-'{FN'=94
-'{LIMIT'=95
-'{D'=96
-'{T'=97
-'{TS'=98
-'{GUID'=99
-'}'=100
-'='=101
-'<=>'=102
-'<'=104
-'<='=105
-'>'=106
-'>='=107
-'+'=108
-'-'=109
-'*'=110
-'/'=111
-'%'=112
-'::'=113
-'||'=114
-'.'=115
-'?'=116
+'CASE'=14
+'CAST'=15
+'CATALOG'=16
+'CATALOGS'=17
+'COLUMNS'=18
+'CONVERT'=19
+'CURRENT_DATE'=20
+'CURRENT_TIME'=21
+'CURRENT_TIMESTAMP'=22
+'DAY'=23
+'DAYS'=24
+'DEBUG'=25
+'DESC'=26
+'DESCRIBE'=27
+'DISTINCT'=28
+'ELSE'=29
+'END'=30
+'ESCAPE'=31
+'EXECUTABLE'=32
+'EXISTS'=33
+'EXPLAIN'=34
+'EXTRACT'=35
+'FALSE'=36
+'FIRST'=37
+'FORMAT'=38
+'FROM'=39
+'FULL'=40
+'FUNCTIONS'=41
+'GRAPHVIZ'=42
+'GROUP'=43
+'HAVING'=44
+'HOUR'=45
+'HOURS'=46
+'IN'=47
+'INNER'=48
+'INTERVAL'=49
+'IS'=50
+'JOIN'=51
+'LAST'=52
+'LEFT'=53
+'LIKE'=54
+'LIMIT'=55
+'MAPPED'=56
+'MATCH'=57
+'MINUTE'=58
+'MINUTES'=59
+'MONTH'=60
+'MONTHS'=61
+'NATURAL'=62
+'NOT'=63
+'NULL'=64
+'NULLS'=65
+'ON'=66
+'OPTIMIZED'=67
+'OR'=68
+'ORDER'=69
+'OUTER'=70
+'PARSED'=71
+'PHYSICAL'=72
+'PLAN'=73
+'RIGHT'=74
+'RLIKE'=75
+'QUERY'=76
+'SCHEMAS'=77
+'SECOND'=78
+'SECONDS'=79
+'SELECT'=80
+'SHOW'=81
+'SYS'=82
+'TABLE'=83
+'TABLES'=84
+'TEXT'=85
+'THEN'=86
+'TRUE'=87
+'TO'=88
+'TYPE'=89
+'TYPES'=90
+'USING'=91
+'VERIFY'=92
+'WHEN'=93
+'WHERE'=94
+'WITH'=95
+'YEAR'=96
+'YEARS'=97
+'{ESCAPE'=98
+'{FN'=99
+'{LIMIT'=100
+'{D'=101
+'{T'=102
+'{TS'=103
+'{GUID'=104
+'}'=105
+'='=106
+'<=>'=107
+'<'=109
+'<='=110
+'>'=111
+'>='=112
+'+'=113
+'-'=114
+'*'=115
+'/'=116
+'%'=117
+'::'=118
+'||'=119
+'.'=120
+'?'=121
diff --git a/x-pack/plugin/sql/src/main/antlr/SqlBaseLexer.tokens b/x-pack/plugin/sql/src/main/antlr/SqlBaseLexer.tokens
index 44cff1d65ad..21925952a2e 100644
--- a/x-pack/plugin/sql/src/main/antlr/SqlBaseLexer.tokens
+++ b/x-pack/plugin/sql/src/main/antlr/SqlBaseLexer.tokens
@@ -11,121 +11,126 @@ AS=10
 ASC=11
 BETWEEN=12
 BY=13
-CAST=14
-CATALOG=15
-CATALOGS=16
-COLUMNS=17
-CONVERT=18
-CURRENT_DATE=19
-CURRENT_TIME=20
-CURRENT_TIMESTAMP=21
-DAY=22
-DAYS=23
-DEBUG=24
-DESC=25
-DESCRIBE=26
-DISTINCT=27
-ESCAPE=28
-EXECUTABLE=29
-EXISTS=30
-EXPLAIN=31
-EXTRACT=32
-FALSE=33
-FIRST=34
-FORMAT=35
-FROM=36
-FULL=37
-FUNCTIONS=38
-GRAPHVIZ=39
-GROUP=40
-HAVING=41
-HOUR=42
-HOURS=43
-IN=44
-INNER=45
-INTERVAL=46
-IS=47
-JOIN=48
-LAST=49
-LEFT=50
-LIKE=51
-LIMIT=52
-MAPPED=53
-MATCH=54
-MINUTE=55
-MINUTES=56
-MONTH=57
-MONTHS=58
-NATURAL=59
-NOT=60
-NULL=61
-NULLS=62
-ON=63
-OPTIMIZED=64
-OR=65
-ORDER=66
-OUTER=67
-PARSED=68
-PHYSICAL=69
-PLAN=70
-RIGHT=71
-RLIKE=72
-QUERY=73
-SCHEMAS=74
-SECOND=75
-SECONDS=76
-SELECT=77
-SHOW=78
-SYS=79
-TABLE=80
-TABLES=81
-TEXT=82
-TRUE=83
-TO=84
-TYPE=85
-TYPES=86
-USING=87
-VERIFY=88
-WHERE=89
-WITH=90
-YEAR=91
-YEARS=92
-ESCAPE_ESC=93
-FUNCTION_ESC=94
-LIMIT_ESC=95
-DATE_ESC=96
-TIME_ESC=97
-TIMESTAMP_ESC=98
-GUID_ESC=99
-ESC_END=100
-EQ=101
-NULLEQ=102
-NEQ=103
-LT=104
-LTE=105
-GT=106
-GTE=107
-PLUS=108
-MINUS=109
-ASTERISK=110
-SLASH=111
-PERCENT=112
-CAST_OP=113
-CONCAT=114
-DOT=115
-PARAM=116
-STRING=117
-INTEGER_VALUE=118
-DECIMAL_VALUE=119
-IDENTIFIER=120
-DIGIT_IDENTIFIER=121
-TABLE_IDENTIFIER=122
-QUOTED_IDENTIFIER=123
-BACKQUOTED_IDENTIFIER=124
-SIMPLE_COMMENT=125
-BRACKETED_COMMENT=126
-WS=127
-UNRECOGNIZED=128
+CASE=14
+CAST=15
+CATALOG=16
+CATALOGS=17
+COLUMNS=18
+CONVERT=19
+CURRENT_DATE=20
+CURRENT_TIME=21
+CURRENT_TIMESTAMP=22
+DAY=23
+DAYS=24
+DEBUG=25
+DESC=26
+DESCRIBE=27
+DISTINCT=28
+ELSE=29
+END=30
+ESCAPE=31
+EXECUTABLE=32
+EXISTS=33
+EXPLAIN=34
+EXTRACT=35
+FALSE=36
+FIRST=37
+FORMAT=38
+FROM=39
+FULL=40
+FUNCTIONS=41
+GRAPHVIZ=42
+GROUP=43
+HAVING=44
+HOUR=45
+HOURS=46
+IN=47
+INNER=48
+INTERVAL=49
+IS=50
+JOIN=51
+LAST=52
+LEFT=53
+LIKE=54
+LIMIT=55
+MAPPED=56
+MATCH=57
+MINUTE=58
+MINUTES=59
+MONTH=60
+MONTHS=61
+NATURAL=62
+NOT=63
+NULL=64
+NULLS=65
+ON=66
+OPTIMIZED=67
+OR=68
+ORDER=69
+OUTER=70
+PARSED=71
+PHYSICAL=72
+PLAN=73
+RIGHT=74
+RLIKE=75
+QUERY=76
+SCHEMAS=77
+SECOND=78
+SECONDS=79
+SELECT=80
+SHOW=81
+SYS=82
+TABLE=83
+TABLES=84
+TEXT=85
+THEN=86
+TRUE=87
+TO=88
+TYPE=89
+TYPES=90
+USING=91
+VERIFY=92
+WHEN=93
+WHERE=94
+WITH=95
+YEAR=96
+YEARS=97
+ESCAPE_ESC=98
+FUNCTION_ESC=99
+LIMIT_ESC=100
+DATE_ESC=101
+TIME_ESC=102
+TIMESTAMP_ESC=103
+GUID_ESC=104
+ESC_END=105
+EQ=106
+NULLEQ=107
+NEQ=108
+LT=109
+LTE=110
+GT=111
+GTE=112
+PLUS=113
+MINUS=114
+ASTERISK=115
+SLASH=116
+PERCENT=117
+CAST_OP=118
+CONCAT=119
+DOT=120
+PARAM=121
+STRING=122
+INTEGER_VALUE=123
+DECIMAL_VALUE=124
+IDENTIFIER=125
+DIGIT_IDENTIFIER=126
+TABLE_IDENTIFIER=127
+QUOTED_IDENTIFIER=128
+BACKQUOTED_IDENTIFIER=129
+SIMPLE_COMMENT=130
+BRACKETED_COMMENT=131
+WS=132
+UNRECOGNIZED=133
 '('=1
 ')'=2
 ','=3
@@ -139,105 +144,110 @@ UNRECOGNIZED=128
 'ASC'=11
 'BETWEEN'=12
 'BY'=13
-'CAST'=14
-'CATALOG'=15
-'CATALOGS'=16
-'COLUMNS'=17
-'CONVERT'=18
-'CURRENT_DATE'=19
-'CURRENT_TIME'=20
-'CURRENT_TIMESTAMP'=21
-'DAY'=22
-'DAYS'=23
-'DEBUG'=24
-'DESC'=25
-'DESCRIBE'=26
-'DISTINCT'=27
-'ESCAPE'=28
-'EXECUTABLE'=29
-'EXISTS'=30
-'EXPLAIN'=31
-'EXTRACT'=32
-'FALSE'=33
-'FIRST'=34
-'FORMAT'=35
-'FROM'=36
-'FULL'=37
-'FUNCTIONS'=38
-'GRAPHVIZ'=39
-'GROUP'=40
-'HAVING'=41
-'HOUR'=42
-'HOURS'=43
-'IN'=44
-'INNER'=45
-'INTERVAL'=46
-'IS'=47
-'JOIN'=48
-'LAST'=49
-'LEFT'=50
-'LIKE'=51
-'LIMIT'=52
-'MAPPED'=53
-'MATCH'=54
-'MINUTE'=55
-'MINUTES'=56
-'MONTH'=57
-'MONTHS'=58
-'NATURAL'=59
-'NOT'=60
-'NULL'=61
-'NULLS'=62
-'ON'=63
-'OPTIMIZED'=64
-'OR'=65
-'ORDER'=66
-'OUTER'=67
-'PARSED'=68
-'PHYSICAL'=69
-'PLAN'=70
-'RIGHT'=71
-'RLIKE'=72
-'QUERY'=73
-'SCHEMAS'=74
-'SECOND'=75
-'SECONDS'=76
-'SELECT'=77
-'SHOW'=78
-'SYS'=79
-'TABLE'=80
-'TABLES'=81
-'TEXT'=82
-'TRUE'=83
-'TO'=84
-'TYPE'=85
-'TYPES'=86
-'USING'=87
-'VERIFY'=88
-'WHERE'=89
-'WITH'=90
-'YEAR'=91
-'YEARS'=92
-'{ESCAPE'=93
-'{FN'=94
-'{LIMIT'=95
-'{D'=96
-'{T'=97
-'{TS'=98
-'{GUID'=99
-'}'=100
-'='=101
-'<=>'=102
-'<'=104
-'<='=105
-'>'=106
-'>='=107
-'+'=108
-'-'=109
-'*'=110
-'/'=111
-'%'=112
-'::'=113
-'||'=114
-'.'=115
-'?'=116
+'CASE'=14
+'CAST'=15
+'CATALOG'=16
+'CATALOGS'=17
+'COLUMNS'=18
+'CONVERT'=19
+'CURRENT_DATE'=20
+'CURRENT_TIME'=21
+'CURRENT_TIMESTAMP'=22
+'DAY'=23
+'DAYS'=24
+'DEBUG'=25
+'DESC'=26
+'DESCRIBE'=27
+'DISTINCT'=28
+'ELSE'=29
+'END'=30
+'ESCAPE'=31
+'EXECUTABLE'=32
+'EXISTS'=33
+'EXPLAIN'=34
+'EXTRACT'=35
+'FALSE'=36
+'FIRST'=37
+'FORMAT'=38
+'FROM'=39
+'FULL'=40
+'FUNCTIONS'=41
+'GRAPHVIZ'=42
+'GROUP'=43
+'HAVING'=44
+'HOUR'=45
+'HOURS'=46
+'IN'=47
+'INNER'=48
+'INTERVAL'=49
+'IS'=50
+'JOIN'=51
+'LAST'=52
+'LEFT'=53
+'LIKE'=54
+'LIMIT'=55
+'MAPPED'=56
+'MATCH'=57
+'MINUTE'=58
+'MINUTES'=59
+'MONTH'=60
+'MONTHS'=61
+'NATURAL'=62
+'NOT'=63
+'NULL'=64
+'NULLS'=65
+'ON'=66
+'OPTIMIZED'=67
+'OR'=68
+'ORDER'=69
+'OUTER'=70
+'PARSED'=71
+'PHYSICAL'=72
+'PLAN'=73
+'RIGHT'=74
+'RLIKE'=75
+'QUERY'=76
+'SCHEMAS'=77
+'SECOND'=78
+'SECONDS'=79
+'SELECT'=80
+'SHOW'=81
+'SYS'=82
+'TABLE'=83
+'TABLES'=84
+'TEXT'=85
+'THEN'=86
+'TRUE'=87
+'TO'=88
+'TYPE'=89
+'TYPES'=90
+'USING'=91
+'VERIFY'=92
+'WHEN'=93
+'WHERE'=94
+'WITH'=95
+'YEAR'=96
+'YEARS'=97
+'{ESCAPE'=98
+'{FN'=99
+'{LIMIT'=100
+'{D'=101
+'{T'=102
+'{TS'=103
+'{GUID'=104
+'}'=105
+'='=106
+'<=>'=107
+'<'=109
+'<='=110
+'>'=111
+'>='=112
+'+'=113
+'-'=114
+'*'=115
+'/'=116
+'%'=117
+'::'=118
+'||'=119
+'.'=120
+'?'=121
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/FunctionRegistry.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/FunctionRegistry.java
index a29b19e4128..883dd0e076a 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/FunctionRegistry.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/FunctionRegistry.java
@@ -94,6 +94,7 @@ import org.elasticsearch.xpack.sql.expression.function.scalar.string.Right;
 import org.elasticsearch.xpack.sql.expression.function.scalar.string.Space;
 import org.elasticsearch.xpack.sql.expression.function.scalar.string.Substring;
 import org.elasticsearch.xpack.sql.expression.function.scalar.string.UCase;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.Case;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Coalesce;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Greatest;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfNull;
@@ -169,7 +170,8 @@ public class FunctionRegistry {
         addToMap(def(Histogram.class, Histogram::new, "HISTOGRAM"));
         // Scalar functions
         // Conditional
-        addToMap(def(Coalesce.class, Coalesce::new, "COALESCE"),
+        addToMap(def(Case.class, Case::new, "CASE"),
+                def(Coalesce.class, Coalesce::new, "COALESCE"),
                 def(IfNull.class, IfNull::new, "IFNULL", "ISNULL", "NVL"),
                 def(NullIf.class, NullIf::new, "NULLIF"),
                 def(Greatest.class, Greatest::new, "GREATEST"),
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/Processors.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/Processors.java
index f5ceb266960..d14aeea507f 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/Processors.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/Processors.java
@@ -28,6 +28,7 @@ import org.elasticsearch.xpack.sql.expression.gen.processor.ChainingProcessor;
 import org.elasticsearch.xpack.sql.expression.gen.processor.ConstantProcessor;
 import org.elasticsearch.xpack.sql.expression.gen.processor.HitExtractorProcessor;
 import org.elasticsearch.xpack.sql.expression.gen.processor.Processor;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.CaseProcessor;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.ConditionalProcessor;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.NullIfProcessor;
 import org.elasticsearch.xpack.sql.expression.predicate.logical.BinaryLogicProcessor;
@@ -62,7 +63,8 @@ public final class Processors {
         // logical
         entries.add(new Entry(Processor.class, BinaryLogicProcessor.NAME, BinaryLogicProcessor::new));
         entries.add(new Entry(Processor.class, NotProcessor.NAME, NotProcessor::new));
-        // null
+        // conditionals
+        entries.add(new Entry(Processor.class, CaseProcessor.NAME, CaseProcessor::new));
         entries.add(new Entry(Processor.class, CheckNullProcessor.NAME, CheckNullProcessor::new));
         entries.add(new Entry(Processor.class, ConditionalProcessor.NAME, ConditionalProcessor::new));
         entries.add(new Entry(Processor.class, NullIfProcessor.NAME, NullIfProcessor::new));
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/whitelist/InternalSqlScriptUtils.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/whitelist/InternalSqlScriptUtils.java
index 570154026b8..6a4ec411fe1 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/whitelist/InternalSqlScriptUtils.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/function/scalar/whitelist/InternalSqlScriptUtils.java
@@ -26,6 +26,7 @@ import org.elasticsearch.xpack.sql.expression.function.scalar.string.StringProce
 import org.elasticsearch.xpack.sql.expression.function.scalar.string.SubstringFunctionProcessor;
 import org.elasticsearch.xpack.sql.expression.literal.IntervalDayTime;
 import org.elasticsearch.xpack.sql.expression.literal.IntervalYearMonth;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.CaseProcessor;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.ConditionalProcessor.ConditionalOperation;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.NullIfProcessor;
 import org.elasticsearch.xpack.sql.expression.predicate.logical.BinaryLogicProcessor.BinaryLogicOperation;
@@ -146,8 +147,12 @@ public final class InternalSqlScriptUtils {
     }
 
     //
-    // Null
+    // Conditional
     //
+    public static Object caseFunction(List<Object> expressions) {
+        return CaseProcessor.apply(expressions);
+    }
+
     public static Object coalesce(List<Object> expressions) {
         return ConditionalOperation.COALESCE.apply(expressions);
     }
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/Case.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/Case.java
new file mode 100644
index 00000000000..772e75f414a
--- /dev/null
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/Case.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.sql.expression.predicate.conditional;
+
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.expression.Expressions;
+import org.elasticsearch.xpack.sql.expression.gen.pipeline.Pipe;
+import org.elasticsearch.xpack.sql.expression.gen.script.ParamsBuilder;
+import org.elasticsearch.xpack.sql.expression.gen.script.ScriptTemplate;
+import org.elasticsearch.xpack.sql.optimizer.Optimizer;
+import org.elasticsearch.xpack.sql.tree.NodeInfo;
+import org.elasticsearch.xpack.sql.tree.Source;
+import org.elasticsearch.xpack.sql.type.DataType;
+import org.elasticsearch.xpack.sql.type.DataTypeConversion;
+import org.elasticsearch.xpack.sql.type.DataTypes;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.StringJoiner;
+
+import static org.elasticsearch.common.logging.LoggerMessageFormat.format;
+import static org.elasticsearch.xpack.sql.expression.gen.script.ParamsBuilder.paramsBuilder;
+
+/**
+ * Implements the CASE WHEN ... THEN ... ELSE ... END expression
+ */
+public class Case extends ConditionalFunction {
+
+    private final List<IfConditional> conditions;
+    private final Expression defaultElse;
+
+    @SuppressWarnings("unchecked")
+    public Case(Source source, List<Expression> expressions) {
+        super(source, expressions);
+        this.conditions = (List<IfConditional>) (List<?>) expressions.subList(0, expressions.size() - 1);
+        this.defaultElse = expressions.get(expressions.size() - 1);
+    }
+
+    public List<IfConditional> conditions() {
+        return conditions;
+    }
+
+    public Expression defaultElse() {
+        return defaultElse;
+    }
+
+    @Override
+    public DataType dataType() {
+        if (dataType == null) {
+            if (conditions.isEmpty()) {
+                dataType = defaultElse().dataType();
+            } else {
+                dataType = DataType.NULL;
+
+                for (IfConditional conditional : conditions) {
+                    dataType = DataTypeConversion.commonType(dataType, conditional.dataType());
+                }
+            }
+        }
+        return dataType;
+    }
+
+    @Override
+    public Expression replaceChildren(List<Expression> newChildren) {
+        return new Case(source(), newChildren);
+    }
+
+    @Override
+    protected NodeInfo<? extends Expression> info() {
+        return NodeInfo.create(this, Case::new, children());
+    }
+
+    @Override
+    protected TypeResolution resolveType() {
+        DataType expectedResultDataType = null;
+        for (IfConditional ifConditional : conditions) {
+            if (DataTypes.isNull(ifConditional.result().dataType()) == false) {
+                expectedResultDataType = ifConditional.result().dataType();
+                break;
+            }
+        }
+        if (expectedResultDataType == null) {
+            expectedResultDataType = defaultElse().dataType();
+        }
+
+        for (IfConditional conditional : conditions) {
+            if (conditional.condition().dataType() != DataType.BOOLEAN) {
+                return new TypeResolution(format(null, "condition of [{}] must be [boolean], found value [{}] type [{}]",
+                    conditional.sourceText(),
+                    Expressions.name(conditional.condition()),
+                    conditional.condition().dataType().typeName));
+            }
+            if (DataTypes.areTypesCompatible(expectedResultDataType, conditional.dataType()) == false) {
+                return new TypeResolution(format(null, "result of [{}] must be [{}], found value [{}] type [{}]",
+                    conditional.sourceText(),
+                    expectedResultDataType.typeName,
+                    Expressions.name(conditional.result()),
+                    conditional.dataType().typeName));
+            }
+        }
+
+        if (DataTypes.areTypesCompatible(expectedResultDataType, defaultElse.dataType()) == false) {
+            return new TypeResolution(format(null, "ELSE clause of [{}] must be [{}], found value [{}] type [{}]",
+                defaultElse.sourceText(),
+                expectedResultDataType.typeName,
+                Expressions.name(defaultElse),
+                defaultElse.dataType().typeName));
+        }
+
+        return TypeResolution.TYPE_RESOLVED;
+    }
+
+    /**
+     * All foldable conditions that fold to FALSE should have
+     * been removed by the {@link Optimizer}.
+     */
+    @Override
+    public boolean foldable() {
+        return (conditions.isEmpty() && defaultElse.foldable()) ||
+            (conditions.size() == 1 && conditions.get(0).condition().foldable() && conditions.get(0).result().foldable());
+    }
+
+    @Override
+    public Object fold() {
+        if (conditions.isEmpty() == false && conditions.get(0).condition().fold() == Boolean.TRUE) {
+            return conditions.get(0).result().fold();
+        }
+        return defaultElse.fold();
+    }
+
+    @Override
+    protected Pipe makePipe() {
+        List<Pipe> pipes = new ArrayList<>(conditions.size() + 1);
+        for (IfConditional ifConditional : conditions) {
+            pipes.add(Expressions.pipe(ifConditional.condition()));
+            pipes.add(Expressions.pipe(ifConditional.result()));
+        }
+        pipes.add(Expressions.pipe(defaultElse));
+        return new CasePipe(source(), this, pipes);
+    }
+
+    @Override
+    public ScriptTemplate asScript() {
+        List<ScriptTemplate> templates = new ArrayList<>();
+        for (IfConditional ifConditional : conditions) {
+            templates.add(asScript(ifConditional.condition()));
+            templates.add(asScript(ifConditional.result()));
+        }
+        templates.add(asScript(defaultElse));
+
+        StringJoiner template = new StringJoiner(",", "{sql}.caseFunction([", "])");
+        ParamsBuilder params = paramsBuilder();
+
+        for (ScriptTemplate scriptTemplate : templates) {
+            template.add(scriptTemplate.template());
+            params.script(scriptTemplate.params());
+        }
+
+        return new ScriptTemplate(formatTemplate(template.toString()), params.build(), dataType());
+    }
+}
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CasePipe.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CasePipe.java
new file mode 100644
index 00000000000..f3beb755c34
--- /dev/null
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CasePipe.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.sql.expression.predicate.conditional;
+
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.expression.gen.pipeline.MultiPipe;
+import org.elasticsearch.xpack.sql.expression.gen.pipeline.Pipe;
+import org.elasticsearch.xpack.sql.expression.gen.processor.Processor;
+import org.elasticsearch.xpack.sql.tree.NodeInfo;
+import org.elasticsearch.xpack.sql.tree.Source;
+
+import java.util.List;
+
+public class CasePipe extends MultiPipe {
+
+    public CasePipe(Source source, Expression expression, List<Pipe> children) {
+        super(source, expression, children);
+    }
+
+    @Override
+    protected NodeInfo<CasePipe> info() {
+        return NodeInfo.create(this, CasePipe::new, expression(), children());
+    }
+
+    @Override
+    public Pipe replaceChildren(List<Pipe> newChildren) {
+        return new CasePipe(source(), expression(), newChildren);
+    }
+
+    @Override
+    public Processor asProcessor(List<Processor> procs) {
+        return new CaseProcessor(procs);
+    }
+}
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseProcessor.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseProcessor.java
new file mode 100644
index 00000000000..634e83401fe
--- /dev/null
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseProcessor.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.sql.expression.predicate.conditional;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.xpack.sql.expression.gen.processor.Processor;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class CaseProcessor implements Processor {
+
+    public static final String NAME = "case";
+
+    private final List<Processor> processors;
+
+    public CaseProcessor(List<Processor> processors) {
+        this.processors = processors;
+    }
+
+    public CaseProcessor(StreamInput in) throws IOException {
+        processors = in.readNamedWriteableList(Processor.class);
+    }
+
+    @Override
+    public String getWriteableName() {
+        return NAME;
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeNamedWriteableList(processors);
+    }
+
+    @Override
+    public Object process(Object input) {
+        List<Object> objects = new ArrayList<>(processors.size());
+        for (Processor processor : processors) {
+            objects.add(processor.process(input));
+        }
+        return apply(objects);
+    }
+
+    public static Object apply(List<Object> objects) {
+        for (int i = 0; i < objects.size() - 2; i += 2) {
+            if (objects.get(i) == Boolean.TRUE) {
+                return objects.get(i + 1);
+            }
+        }
+        // resort to default value
+        return objects.get(objects.size() - 1);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        CaseProcessor that = (CaseProcessor) o;
+        return Objects.equals(processors, that.processors);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(processors);
+    }
+}
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/ConditionalFunction.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/ConditionalFunction.java
index b3841f09e82..79c3f906b40 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/ConditionalFunction.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/ConditionalFunction.java
@@ -15,6 +15,7 @@ import org.elasticsearch.xpack.sql.type.DataType;
 import org.elasticsearch.xpack.sql.type.DataTypeConversion;
 
 import java.util.List;
+import java.util.Objects;
 
 import static org.elasticsearch.common.logging.LoggerMessageFormat.format;
 import static org.elasticsearch.xpack.sql.type.DataTypes.areTypesCompatible;
@@ -75,4 +76,21 @@ public abstract class ConditionalFunction extends ScalarFunction {
     public Nullability nullable() {
         return Nullability.UNKNOWN;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        ConditionalFunction that = (ConditionalFunction) o;
+        return children().equals(that.children());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(children());
+    }
 }
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/IfConditional.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/IfConditional.java
new file mode 100644
index 00000000000..298f7d67329
--- /dev/null
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/IfConditional.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.sql.expression.predicate.conditional;
+
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.expression.Nullability;
+import org.elasticsearch.xpack.sql.tree.NodeInfo;
+import org.elasticsearch.xpack.sql.tree.Source;
+import org.elasticsearch.xpack.sql.type.DataType;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Helper expression (cannot be created directly from a query) to model a
+ * {@code WHEN <condition> ELSE <result>} clause of {@link Case} expression
+ */
+public class IfConditional extends Expression {
+
+    private final Expression condition;
+    private final Expression result;
+
+    public IfConditional(Source source, Expression condition, Expression result) {
+        super(source, Arrays.asList(condition, result));
+        this.condition = condition;
+        this.result = result;
+    }
+
+    public Expression condition() {
+        return condition;
+    }
+
+    public Expression result() {
+        return result;
+    }
+
+    @Override
+    public Nullability nullable() {
+        return Nullability.UNKNOWN;
+    }
+
+    @Override
+    public DataType dataType() {
+        return result.dataType();
+    }
+
+    @Override
+    public Expression replaceChildren(List<Expression> newChildren) {
+        if (newChildren.size() < 2) {
+            throw new IllegalArgumentException("expected at least [2] children but received [" + newChildren.size() + "]");
+        }
+        return new IfConditional(source(), newChildren.get(0), newChildren.get(1));
+    }
+
+    @Override
+    protected NodeInfo<? extends Expression> info() {
+        return NodeInfo.create(this, IfConditional::new, condition, result);
+    }
+
+    @Override
+    protected TypeResolution resolveType() {
+        // Verification takes place is Case function to be
+        // able to generate more accurate error messages
+        return TypeResolution.TYPE_RESOLVED;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        if (!super.equals(o)) {
+            return false;
+        }
+
+        IfConditional that = (IfConditional) o;
+        return Objects.equals(condition, that.condition) &&
+            Objects.equals(result, that.result);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(condition, result);
+    }
+}
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/optimizer/Optimizer.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/optimizer/Optimizer.java
index eafdf21b119..78cc16470ca 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/optimizer/Optimizer.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/optimizer/Optimizer.java
@@ -48,7 +48,9 @@ import org.elasticsearch.xpack.sql.expression.predicate.Negatable;
 import org.elasticsearch.xpack.sql.expression.predicate.Predicates;
 import org.elasticsearch.xpack.sql.expression.predicate.Range;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.ArbitraryConditionalFunction;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.Case;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Coalesce;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfConditional;
 import org.elasticsearch.xpack.sql.expression.predicate.logical.And;
 import org.elasticsearch.xpack.sql.expression.predicate.logical.Not;
 import org.elasticsearch.xpack.sql.expression.predicate.logical.Or;
@@ -127,6 +129,7 @@ public class Optimizer extends RuleExecutor<LogicalPlan> {
                 new FoldNull(),
                 new ConstantFolding(),
                 new SimplifyConditional(),
+                new SimplifyCase(),
                 // boolean
                 new BooleanSimplification(),
                 new BooleanLiteralsOnTheRight(),
@@ -1227,6 +1230,40 @@ public class Optimizer extends RuleExecutor<LogicalPlan> {
         }
     }
 
+    static class SimplifyCase extends OptimizerExpressionRule {
+
+        SimplifyCase() {
+            super(TransformDirection.DOWN);
+        }
+
+        @Override
+        protected Expression rule(Expression e) {
+            if (e instanceof Case) {
+                Case c = (Case) e;
+
+                // Remove or foldable conditions that fold to FALSE
+                // Stop at the 1st foldable condition that folds to TRUE
+                List<IfConditional> newConditions = new ArrayList<>();
+                for (IfConditional conditional : c.conditions()) {
+                    if (conditional.condition().foldable()) {
+                        Boolean res = (Boolean) conditional.condition().fold();
+                        if (res == Boolean.TRUE) {
+                            newConditions.add(conditional);
+                            break;
+                        }
+                    } else {
+                        newConditions.add(conditional);
+                    }
+                }
+
+                if (newConditions.size() < c.children().size()) {
+                    return c.replaceChildren(combine(newConditions, c.defaultElse()));
+                }
+            }
+
+            return e;
+        }
+    }
 
     static class BooleanSimplification extends OptimizerExpressionRule {
 
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/ExpressionBuilder.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/ExpressionBuilder.java
index ad2539ab99b..88b4cefd9b9 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/ExpressionBuilder.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/ExpressionBuilder.java
@@ -32,6 +32,8 @@ import org.elasticsearch.xpack.sql.expression.literal.IntervalYearMonth;
 import org.elasticsearch.xpack.sql.expression.literal.Intervals;
 import org.elasticsearch.xpack.sql.expression.literal.Intervals.TimeUnit;
 import org.elasticsearch.xpack.sql.expression.predicate.Range;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.Case;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfConditional;
 import org.elasticsearch.xpack.sql.expression.predicate.fulltext.MatchQueryPredicate;
 import org.elasticsearch.xpack.sql.expression.predicate.fulltext.MultiMatchQueryPredicate;
 import org.elasticsearch.xpack.sql.expression.predicate.fulltext.StringQueryPredicate;
@@ -116,6 +118,7 @@ import java.time.Duration;
 import java.time.Period;
 import java.time.format.DateTimeParseException;
 import java.time.temporal.TemporalAmount;
+import java.util.ArrayList;
 import java.util.EnumSet;
 import java.util.List;
 import java.util.Locale;
@@ -459,6 +462,25 @@ abstract class ExpressionBuilder extends IdentifierBuilder {
         return new ScalarSubquery(source(ctx), plan(ctx.query()));
     }
 
+    @Override
+    public Object visitCase(SqlBaseParser.CaseContext ctx) {
+        List<Expression> expressions = new ArrayList<>(ctx.whenClause().size());
+        for (SqlBaseParser.WhenClauseContext when : ctx.whenClause()) {
+            if (ctx.operand != null) {
+                expressions.add(new IfConditional(source(when),
+                    new Equals(source(when), expression(ctx.operand), expression(when.condition)), expression(when.result)));
+            } else {
+                expressions.add(new IfConditional(source(when), expression(when.condition), expression(when.result)));
+            }
+        }
+        if (ctx.elseClause != null) {
+            expressions.add(expression(ctx.elseClause));
+        } else {
+            expressions.add(Literal.NULL);
+        }
+        return new Case(source(ctx), expressions);
+    }
+
     @Override
     public Expression visitParenthesizedExpression(ParenthesizedExpressionContext ctx) {
         return expression(ctx.expression());
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseListener.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseListener.java
index bf5055ae216..9e8dd6cd6af 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseListener.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseListener.java
@@ -743,6 +743,18 @@ class SqlBaseBaseListener implements SqlBaseListener {
    * <p>The default implementation does nothing.</p>
    */
   @Override public void exitSubqueryExpression(SqlBaseParser.SubqueryExpressionContext ctx) { }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation does nothing.</p>
+   */
+  @Override public void enterCase(SqlBaseParser.CaseContext ctx) { }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation does nothing.</p>
+   */
+  @Override public void exitCase(SqlBaseParser.CaseContext ctx) { }
   /**
    * {@inheritDoc}
    *
@@ -1151,6 +1163,18 @@ class SqlBaseBaseListener implements SqlBaseListener {
    * <p>The default implementation does nothing.</p>
    */
   @Override public void exitString(SqlBaseParser.StringContext ctx) { }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation does nothing.</p>
+   */
+  @Override public void enterWhenClause(SqlBaseParser.WhenClauseContext ctx) { }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation does nothing.</p>
+   */
+  @Override public void exitWhenClause(SqlBaseParser.WhenClauseContext ctx) { }
   /**
    * {@inheritDoc}
    *
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseVisitor.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseVisitor.java
index 02d92832149..199fb407698 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseVisitor.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseBaseVisitor.java
@@ -438,6 +438,13 @@ class SqlBaseBaseVisitor<T> extends AbstractParseTreeVisitor<T> implements SqlBa
    * {@link #visitChildren} on {@code ctx}.</p>
    */
   @Override public T visitSubqueryExpression(SqlBaseParser.SubqueryExpressionContext ctx) { return visitChildren(ctx); }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation returns the result of calling
+   * {@link #visitChildren} on {@code ctx}.</p>
+   */
+  @Override public T visitCase(SqlBaseParser.CaseContext ctx) { return visitChildren(ctx); }
   /**
    * {@inheritDoc}
    *
@@ -676,6 +683,13 @@ class SqlBaseBaseVisitor<T> extends AbstractParseTreeVisitor<T> implements SqlBa
    * {@link #visitChildren} on {@code ctx}.</p>
    */
   @Override public T visitString(SqlBaseParser.StringContext ctx) { return visitChildren(ctx); }
+  /**
+   * {@inheritDoc}
+   *
+   * <p>The default implementation returns the result of calling
+   * {@link #visitChildren} on {@code ctx}.</p>
+   */
+  @Override public T visitWhenClause(SqlBaseParser.WhenClauseContext ctx) { return visitChildren(ctx); }
   /**
    * {@inheritDoc}
    *
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseLexer.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseLexer.java
index 132675e4178..a537f9f369e 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseLexer.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseLexer.java
@@ -1,13 +1,16 @@
 // ANTLR GENERATED CODE: DO NOT EDIT
 package org.elasticsearch.xpack.sql.parser;
-import org.antlr.v4.runtime.Lexer;
+
 import org.antlr.v4.runtime.CharStream;
-import org.antlr.v4.runtime.Token;
-import org.antlr.v4.runtime.TokenStream;
-import org.antlr.v4.runtime.*;
-import org.antlr.v4.runtime.atn.*;
+import org.antlr.v4.runtime.Lexer;
+import org.antlr.v4.runtime.RuntimeMetaData;
+import org.antlr.v4.runtime.Vocabulary;
+import org.antlr.v4.runtime.VocabularyImpl;
+import org.antlr.v4.runtime.atn.ATN;
+import org.antlr.v4.runtime.atn.ATNDeserializer;
+import org.antlr.v4.runtime.atn.LexerATNSimulator;
+import org.antlr.v4.runtime.atn.PredictionContextCache;
 import org.antlr.v4.runtime.dfa.DFA;
-import org.antlr.v4.runtime.misc.*;
 
 @SuppressWarnings({"all", "warnings", "unchecked", "unused", "cast"})
 class SqlBaseLexer extends Lexer {
@@ -18,88 +21,90 @@ class SqlBaseLexer extends Lexer {
     new PredictionContextCache();
   public static final int
     T__0=1, T__1=2, T__2=3, T__3=4, ALL=5, ANALYZE=6, ANALYZED=7, AND=8, ANY=9, 
-    AS=10, ASC=11, BETWEEN=12, BY=13, CAST=14, CATALOG=15, CATALOGS=16, COLUMNS=17, 
-    CONVERT=18, CURRENT_DATE=19, CURRENT_TIME=20, CURRENT_TIMESTAMP=21, DAY=22, 
-    DAYS=23, DEBUG=24, DESC=25, DESCRIBE=26, DISTINCT=27, ESCAPE=28, EXECUTABLE=29, 
-    EXISTS=30, EXPLAIN=31, EXTRACT=32, FALSE=33, FIRST=34, FORMAT=35, FROM=36, 
-    FULL=37, FUNCTIONS=38, GRAPHVIZ=39, GROUP=40, HAVING=41, HOUR=42, HOURS=43, 
-    IN=44, INNER=45, INTERVAL=46, IS=47, JOIN=48, LAST=49, LEFT=50, LIKE=51, 
-    LIMIT=52, MAPPED=53, MATCH=54, MINUTE=55, MINUTES=56, MONTH=57, MONTHS=58, 
-    NATURAL=59, NOT=60, NULL=61, NULLS=62, ON=63, OPTIMIZED=64, OR=65, ORDER=66, 
-    OUTER=67, PARSED=68, PHYSICAL=69, PLAN=70, RIGHT=71, RLIKE=72, QUERY=73, 
-    SCHEMAS=74, SECOND=75, SECONDS=76, SELECT=77, SHOW=78, SYS=79, TABLE=80, 
-    TABLES=81, TEXT=82, TRUE=83, TO=84, TYPE=85, TYPES=86, USING=87, VERIFY=88, 
-    WHERE=89, WITH=90, YEAR=91, YEARS=92, ESCAPE_ESC=93, FUNCTION_ESC=94, 
-    LIMIT_ESC=95, DATE_ESC=96, TIME_ESC=97, TIMESTAMP_ESC=98, GUID_ESC=99, 
-    ESC_END=100, EQ=101, NULLEQ=102, NEQ=103, LT=104, LTE=105, GT=106, GTE=107, 
-    PLUS=108, MINUS=109, ASTERISK=110, SLASH=111, PERCENT=112, CAST_OP=113, 
-    CONCAT=114, DOT=115, PARAM=116, STRING=117, INTEGER_VALUE=118, DECIMAL_VALUE=119, 
-    IDENTIFIER=120, DIGIT_IDENTIFIER=121, TABLE_IDENTIFIER=122, QUOTED_IDENTIFIER=123, 
-    BACKQUOTED_IDENTIFIER=124, SIMPLE_COMMENT=125, BRACKETED_COMMENT=126, 
-    WS=127, UNRECOGNIZED=128;
+    AS=10, ASC=11, BETWEEN=12, BY=13, CASE=14, CAST=15, CATALOG=16, CATALOGS=17, 
+    COLUMNS=18, CONVERT=19, CURRENT_DATE=20, CURRENT_TIME=21, CURRENT_TIMESTAMP=22, 
+    DAY=23, DAYS=24, DEBUG=25, DESC=26, DESCRIBE=27, DISTINCT=28, ELSE=29, 
+    END=30, ESCAPE=31, EXECUTABLE=32, EXISTS=33, EXPLAIN=34, EXTRACT=35, FALSE=36, 
+    FIRST=37, FORMAT=38, FROM=39, FULL=40, FUNCTIONS=41, GRAPHVIZ=42, GROUP=43, 
+    HAVING=44, HOUR=45, HOURS=46, IN=47, INNER=48, INTERVAL=49, IS=50, JOIN=51, 
+    LAST=52, LEFT=53, LIKE=54, LIMIT=55, MAPPED=56, MATCH=57, MINUTE=58, MINUTES=59, 
+    MONTH=60, MONTHS=61, NATURAL=62, NOT=63, NULL=64, NULLS=65, ON=66, OPTIMIZED=67, 
+    OR=68, ORDER=69, OUTER=70, PARSED=71, PHYSICAL=72, PLAN=73, RIGHT=74, 
+    RLIKE=75, QUERY=76, SCHEMAS=77, SECOND=78, SECONDS=79, SELECT=80, SHOW=81, 
+    SYS=82, TABLE=83, TABLES=84, TEXT=85, THEN=86, TRUE=87, TO=88, TYPE=89, 
+    TYPES=90, USING=91, VERIFY=92, WHEN=93, WHERE=94, WITH=95, YEAR=96, YEARS=97, 
+    ESCAPE_ESC=98, FUNCTION_ESC=99, LIMIT_ESC=100, DATE_ESC=101, TIME_ESC=102, 
+    TIMESTAMP_ESC=103, GUID_ESC=104, ESC_END=105, EQ=106, NULLEQ=107, NEQ=108, 
+    LT=109, LTE=110, GT=111, GTE=112, PLUS=113, MINUS=114, ASTERISK=115, SLASH=116, 
+    PERCENT=117, CAST_OP=118, CONCAT=119, DOT=120, PARAM=121, STRING=122, 
+    INTEGER_VALUE=123, DECIMAL_VALUE=124, IDENTIFIER=125, DIGIT_IDENTIFIER=126, 
+    TABLE_IDENTIFIER=127, QUOTED_IDENTIFIER=128, BACKQUOTED_IDENTIFIER=129, 
+    SIMPLE_COMMENT=130, BRACKETED_COMMENT=131, WS=132, UNRECOGNIZED=133;
   public static String[] modeNames = {
     "DEFAULT_MODE"
   };
 
   public static final String[] ruleNames = {
     "T__0", "T__1", "T__2", "T__3", "ALL", "ANALYZE", "ANALYZED", "AND", "ANY", 
-    "AS", "ASC", "BETWEEN", "BY", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
+    "AS", "ASC", "BETWEEN", "BY", "CASE", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
     "CONVERT", "CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", "DAY", 
-    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", 
-    "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", "FROM", "FULL", 
-    "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", "IN", "INNER", 
-    "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", 
-    "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", 
-    "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", 
-    "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", 
-    "SYS", "TABLE", "TABLES", "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", 
-    "VERIFY", "WHERE", "WITH", "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", 
-    "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", "GUID_ESC", "ESC_END", 
-    "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", "PLUS", "MINUS", "ASTERISK", 
-    "SLASH", "PERCENT", "CAST_OP", "CONCAT", "DOT", "PARAM", "STRING", "INTEGER_VALUE", 
-    "DECIMAL_VALUE", "IDENTIFIER", "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", 
-    "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", "EXPONENT", "DIGIT", "LETTER", 
-    "SIMPLE_COMMENT", "BRACKETED_COMMENT", "WS", "UNRECOGNIZED"
+    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ELSE", "END", "ESCAPE", 
+    "EXECUTABLE", "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", 
+    "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", 
+    "IN", "INNER", "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", 
+    "MAPPED", "MATCH", "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", 
+    "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", 
+    "PHYSICAL", "PLAN", "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", 
+    "SELECT", "SHOW", "SYS", "TABLE", "TABLES", "TEXT", "THEN", "TRUE", "TO", 
+    "TYPE", "TYPES", "USING", "VERIFY", "WHEN", "WHERE", "WITH", "YEAR", "YEARS", 
+    "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", 
+    "GUID_ESC", "ESC_END", "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", 
+    "PLUS", "MINUS", "ASTERISK", "SLASH", "PERCENT", "CAST_OP", "CONCAT", 
+    "DOT", "PARAM", "STRING", "INTEGER_VALUE", "DECIMAL_VALUE", "IDENTIFIER", 
+    "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", 
+    "EXPONENT", "DIGIT", "LETTER", "SIMPLE_COMMENT", "BRACKETED_COMMENT", 
+    "WS", "UNRECOGNIZED"
   };
 
   private static final String[] _LITERAL_NAMES = {
     null, "'('", "')'", "','", "':'", "'ALL'", "'ANALYZE'", "'ANALYZED'", 
-    "'AND'", "'ANY'", "'AS'", "'ASC'", "'BETWEEN'", "'BY'", "'CAST'", "'CATALOG'", 
-    "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT_DATE'", "'CURRENT_TIME'", 
-    "'CURRENT_TIMESTAMP'", "'DAY'", "'DAYS'", "'DEBUG'", "'DESC'", "'DESCRIBE'", 
-    "'DISTINCT'", "'ESCAPE'", "'EXECUTABLE'", "'EXISTS'", "'EXPLAIN'", "'EXTRACT'", 
-    "'FALSE'", "'FIRST'", "'FORMAT'", "'FROM'", "'FULL'", "'FUNCTIONS'", "'GRAPHVIZ'", 
-    "'GROUP'", "'HAVING'", "'HOUR'", "'HOURS'", "'IN'", "'INNER'", "'INTERVAL'", 
-    "'IS'", "'JOIN'", "'LAST'", "'LEFT'", "'LIKE'", "'LIMIT'", "'MAPPED'", 
-    "'MATCH'", "'MINUTE'", "'MINUTES'", "'MONTH'", "'MONTHS'", "'NATURAL'", 
-    "'NOT'", "'NULL'", "'NULLS'", "'ON'", "'OPTIMIZED'", "'OR'", "'ORDER'", 
-    "'OUTER'", "'PARSED'", "'PHYSICAL'", "'PLAN'", "'RIGHT'", "'RLIKE'", "'QUERY'", 
-    "'SCHEMAS'", "'SECOND'", "'SECONDS'", "'SELECT'", "'SHOW'", "'SYS'", "'TABLE'", 
-    "'TABLES'", "'TEXT'", "'TRUE'", "'TO'", "'TYPE'", "'TYPES'", "'USING'", 
-    "'VERIFY'", "'WHERE'", "'WITH'", "'YEAR'", "'YEARS'", "'{ESCAPE'", "'{FN'", 
-    "'{LIMIT'", "'{D'", "'{T'", "'{TS'", "'{GUID'", "'}'", "'='", "'<=>'", 
-    null, "'<'", "'<='", "'>'", "'>='", "'+'", "'-'", "'*'", "'/'", "'%'", 
-    "'::'", "'||'", "'.'", "'?'"
+    "'AND'", "'ANY'", "'AS'", "'ASC'", "'BETWEEN'", "'BY'", "'CASE'", "'CAST'", 
+    "'CATALOG'", "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT_DATE'", 
+    "'CURRENT_TIME'", "'CURRENT_TIMESTAMP'", "'DAY'", "'DAYS'", "'DEBUG'", 
+    "'DESC'", "'DESCRIBE'", "'DISTINCT'", "'ELSE'", "'END'", "'ESCAPE'", "'EXECUTABLE'", 
+    "'EXISTS'", "'EXPLAIN'", "'EXTRACT'", "'FALSE'", "'FIRST'", "'FORMAT'", 
+    "'FROM'", "'FULL'", "'FUNCTIONS'", "'GRAPHVIZ'", "'GROUP'", "'HAVING'", 
+    "'HOUR'", "'HOURS'", "'IN'", "'INNER'", "'INTERVAL'", "'IS'", "'JOIN'", 
+    "'LAST'", "'LEFT'", "'LIKE'", "'LIMIT'", "'MAPPED'", "'MATCH'", "'MINUTE'", 
+    "'MINUTES'", "'MONTH'", "'MONTHS'", "'NATURAL'", "'NOT'", "'NULL'", "'NULLS'", 
+    "'ON'", "'OPTIMIZED'", "'OR'", "'ORDER'", "'OUTER'", "'PARSED'", "'PHYSICAL'", 
+    "'PLAN'", "'RIGHT'", "'RLIKE'", "'QUERY'", "'SCHEMAS'", "'SECOND'", "'SECONDS'", 
+    "'SELECT'", "'SHOW'", "'SYS'", "'TABLE'", "'TABLES'", "'TEXT'", "'THEN'", 
+    "'TRUE'", "'TO'", "'TYPE'", "'TYPES'", "'USING'", "'VERIFY'", "'WHEN'", 
+    "'WHERE'", "'WITH'", "'YEAR'", "'YEARS'", "'{ESCAPE'", "'{FN'", "'{LIMIT'", 
+    "'{D'", "'{T'", "'{TS'", "'{GUID'", "'}'", "'='", "'<=>'", null, "'<'", 
+    "'<='", "'>'", "'>='", "'+'", "'-'", "'*'", "'/'", "'%'", "'::'", "'||'", 
+    "'.'", "'?'"
   };
   private static final String[] _SYMBOLIC_NAMES = {
     null, null, null, null, null, "ALL", "ANALYZE", "ANALYZED", "AND", "ANY", 
-    "AS", "ASC", "BETWEEN", "BY", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
+    "AS", "ASC", "BETWEEN", "BY", "CASE", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
     "CONVERT", "CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", "DAY", 
-    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", 
-    "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", "FROM", "FULL", 
-    "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", "IN", "INNER", 
-    "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", 
-    "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", 
-    "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", 
-    "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", 
-    "SYS", "TABLE", "TABLES", "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", 
-    "VERIFY", "WHERE", "WITH", "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", 
-    "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", "GUID_ESC", "ESC_END", 
-    "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", "PLUS", "MINUS", "ASTERISK", 
-    "SLASH", "PERCENT", "CAST_OP", "CONCAT", "DOT", "PARAM", "STRING", "INTEGER_VALUE", 
-    "DECIMAL_VALUE", "IDENTIFIER", "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", 
-    "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", "SIMPLE_COMMENT", "BRACKETED_COMMENT", 
-    "WS", "UNRECOGNIZED"
+    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ELSE", "END", "ESCAPE", 
+    "EXECUTABLE", "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", 
+    "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", 
+    "IN", "INNER", "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", 
+    "MAPPED", "MATCH", "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", 
+    "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", 
+    "PHYSICAL", "PLAN", "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", 
+    "SELECT", "SHOW", "SYS", "TABLE", "TABLES", "TEXT", "THEN", "TRUE", "TO", 
+    "TYPE", "TYPES", "USING", "VERIFY", "WHEN", "WHERE", "WITH", "YEAR", "YEARS", 
+    "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", 
+    "GUID_ESC", "ESC_END", "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", 
+    "PLUS", "MINUS", "ASTERISK", "SLASH", "PERCENT", "CAST_OP", "CONCAT", 
+    "DOT", "PARAM", "STRING", "INTEGER_VALUE", "DECIMAL_VALUE", "IDENTIFIER", 
+    "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", 
+    "SIMPLE_COMMENT", "BRACKETED_COMMENT", "WS", "UNRECOGNIZED"
   };
   public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -156,7 +161,7 @@ class SqlBaseLexer extends Lexer {
   public ATN getATN() { return _ATN; }
 
   public static final String _serializedATN =
-    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\2\u0082\u043c\b\1\4"+
+    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\2\u0087\u045e\b\1\4"+
     "\2\t\2\4\3\t\3\4\4\t\4\4\5\t\5\4\6\t\6\4\7\t\7\4\b\t\b\4\t\t\t\4\n\t\n"+
     "\4\13\t\13\4\f\t\f\4\r\t\r\4\16\t\16\4\17\t\17\4\20\t\20\4\21\t\21\4\22"+
     "\t\22\4\23\t\23\4\24\t\24\4\25\t\25\4\26\t\26\4\27\t\27\4\30\t\30\4\31"+
@@ -171,55 +176,60 @@ class SqlBaseLexer extends Lexer {
     "\tk\4l\tl\4m\tm\4n\tn\4o\to\4p\tp\4q\tq\4r\tr\4s\ts\4t\tt\4u\tu\4v\tv"+
     "\4w\tw\4x\tx\4y\ty\4z\tz\4{\t{\4|\t|\4}\t}\4~\t~\4\177\t\177\4\u0080\t"+
     "\u0080\4\u0081\t\u0081\4\u0082\t\u0082\4\u0083\t\u0083\4\u0084\t\u0084"+
-    "\3\2\3\2\3\3\3\3\3\4\3\4\3\5\3\5\3\6\3\6\3\6\3\6\3\7\3\7\3\7\3\7\3\7\3"+
-    "\7\3\7\3\7\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\t\3\t\3\t\3\t\3\n\3\n"+
-    "\3\n\3\n\3\13\3\13\3\13\3\f\3\f\3\f\3\f\3\r\3\r\3\r\3\r\3\r\3\r\3\r\3"+
-    "\r\3\16\3\16\3\16\3\17\3\17\3\17\3\17\3\17\3\20\3\20\3\20\3\20\3\20\3"+
-    "\20\3\20\3\20\3\21\3\21\3\21\3\21\3\21\3\21\3\21\3\21\3\21\3\22\3\22\3"+
-    "\22\3\22\3\22\3\22\3\22\3\22\3\23\3\23\3\23\3\23\3\23\3\23\3\23\3\23\3"+
-    "\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\24\3\25\3"+
-    "\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\26\3\26\3"+
-    "\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3"+
-    "\26\3\26\3\27\3\27\3\27\3\27\3\30\3\30\3\30\3\30\3\30\3\31\3\31\3\31\3"+
-    "\31\3\31\3\31\3\32\3\32\3\32\3\32\3\32\3\33\3\33\3\33\3\33\3\33\3\33\3"+
-    "\33\3\33\3\33\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\35\3\35\3"+
-    "\35\3\35\3\35\3\35\3\35\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3"+
-    "\36\3\36\3\37\3\37\3\37\3\37\3\37\3\37\3\37\3 \3 \3 \3 \3 \3 \3 \3 \3"+
-    "!\3!\3!\3!\3!\3!\3!\3!\3\"\3\"\3\"\3\"\3\"\3\"\3#\3#\3#\3#\3#\3#\3$\3"+
-    "$\3$\3$\3$\3$\3$\3%\3%\3%\3%\3%\3&\3&\3&\3&\3&\3\'\3\'\3\'\3\'\3\'\3\'"+
-    "\3\'\3\'\3\'\3\'\3(\3(\3(\3(\3(\3(\3(\3(\3(\3)\3)\3)\3)\3)\3)\3*\3*\3"+
-    "*\3*\3*\3*\3*\3+\3+\3+\3+\3+\3,\3,\3,\3,\3,\3,\3-\3-\3-\3.\3.\3.\3.\3"+
-    ".\3.\3/\3/\3/\3/\3/\3/\3/\3/\3/\3\60\3\60\3\60\3\61\3\61\3\61\3\61\3\61"+
-    "\3\62\3\62\3\62\3\62\3\62\3\63\3\63\3\63\3\63\3\63\3\64\3\64\3\64\3\64"+
-    "\3\64\3\65\3\65\3\65\3\65\3\65\3\65\3\66\3\66\3\66\3\66\3\66\3\66\3\66"+
-    "\3\67\3\67\3\67\3\67\3\67\3\67\38\38\38\38\38\38\38\39\39\39\39\39\39"+
-    "\39\39\3:\3:\3:\3:\3:\3:\3;\3;\3;\3;\3;\3;\3;\3<\3<\3<\3<\3<\3<\3<\3<"+
-    "\3=\3=\3=\3=\3>\3>\3>\3>\3>\3?\3?\3?\3?\3?\3?\3@\3@\3@\3A\3A\3A\3A\3A"+
-    "\3A\3A\3A\3A\3A\3B\3B\3B\3C\3C\3C\3C\3C\3C\3D\3D\3D\3D\3D\3D\3E\3E\3E"+
-    "\3E\3E\3E\3E\3F\3F\3F\3F\3F\3F\3F\3F\3F\3G\3G\3G\3G\3G\3H\3H\3H\3H\3H"+
-    "\3H\3I\3I\3I\3I\3I\3I\3J\3J\3J\3J\3J\3J\3K\3K\3K\3K\3K\3K\3K\3K\3L\3L"+
-    "\3L\3L\3L\3L\3L\3M\3M\3M\3M\3M\3M\3M\3M\3N\3N\3N\3N\3N\3N\3N\3O\3O\3O"+
-    "\3O\3O\3P\3P\3P\3P\3Q\3Q\3Q\3Q\3Q\3Q\3R\3R\3R\3R\3R\3R\3R\3S\3S\3S\3S"+
-    "\3S\3T\3T\3T\3T\3T\3U\3U\3U\3V\3V\3V\3V\3V\3W\3W\3W\3W\3W\3W\3X\3X\3X"+
-    "\3X\3X\3X\3Y\3Y\3Y\3Y\3Y\3Y\3Y\3Z\3Z\3Z\3Z\3Z\3Z\3[\3[\3[\3[\3[\3\\\3"+
-    "\\\3\\\3\\\3\\\3]\3]\3]\3]\3]\3]\3^\3^\3^\3^\3^\3^\3^\3^\3_\3_\3_\3_\3"+
-    "`\3`\3`\3`\3`\3`\3`\3a\3a\3a\3b\3b\3b\3c\3c\3c\3c\3d\3d\3d\3d\3d\3d\3"+
-    "e\3e\3f\3f\3g\3g\3g\3g\3h\3h\3h\3h\5h\u037a\nh\3i\3i\3j\3j\3j\3k\3k\3"+
-    "l\3l\3l\3m\3m\3n\3n\3o\3o\3p\3p\3q\3q\3r\3r\3r\3s\3s\3s\3t\3t\3u\3u\3"+
-    "v\3v\3v\3v\7v\u039e\nv\fv\16v\u03a1\13v\3v\3v\3w\6w\u03a6\nw\rw\16w\u03a7"+
-    "\3x\6x\u03ab\nx\rx\16x\u03ac\3x\3x\7x\u03b1\nx\fx\16x\u03b4\13x\3x\3x"+
-    "\6x\u03b8\nx\rx\16x\u03b9\3x\6x\u03bd\nx\rx\16x\u03be\3x\3x\7x\u03c3\n"+
-    "x\fx\16x\u03c6\13x\5x\u03c8\nx\3x\3x\3x\3x\6x\u03ce\nx\rx\16x\u03cf\3"+
-    "x\3x\5x\u03d4\nx\3y\3y\5y\u03d8\ny\3y\3y\3y\7y\u03dd\ny\fy\16y\u03e0\13"+
-    "y\3z\3z\3z\3z\6z\u03e6\nz\rz\16z\u03e7\3{\3{\3{\6{\u03ed\n{\r{\16{\u03ee"+
-    "\3|\3|\3|\3|\7|\u03f5\n|\f|\16|\u03f8\13|\3|\3|\3}\3}\3}\3}\7}\u0400\n"+
-    "}\f}\16}\u0403\13}\3}\3}\3~\3~\5~\u0409\n~\3~\6~\u040c\n~\r~\16~\u040d"+
-    "\3\177\3\177\3\u0080\3\u0080\3\u0081\3\u0081\3\u0081\3\u0081\7\u0081\u0418"+
-    "\n\u0081\f\u0081\16\u0081\u041b\13\u0081\3\u0081\5\u0081\u041e\n\u0081"+
-    "\3\u0081\5\u0081\u0421\n\u0081\3\u0081\3\u0081\3\u0082\3\u0082\3\u0082"+
-    "\3\u0082\3\u0082\7\u0082\u042a\n\u0082\f\u0082\16\u0082\u042d\13\u0082"+
-    "\3\u0082\3\u0082\3\u0082\3\u0082\3\u0082\3\u0083\6\u0083\u0435\n\u0083"+
-    "\r\u0083\16\u0083\u0436\3\u0083\3\u0083\3\u0084\3\u0084\3\u042b\2\u0085"+
+    "\4\u0085\t\u0085\4\u0086\t\u0086\4\u0087\t\u0087\4\u0088\t\u0088\4\u0089"+
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+    "\7\3\7\3\7\3\7\3\7\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\b\3\t\3\t\3\t\3\t"+
+    "\3\n\3\n\3\n\3\n\3\13\3\13\3\13\3\f\3\f\3\f\3\f\3\r\3\r\3\r\3\r\3\r\3"+
+    "\r\3\r\3\r\3\16\3\16\3\16\3\17\3\17\3\17\3\17\3\17\3\20\3\20\3\20\3\20"+
+    "\3\20\3\21\3\21\3\21\3\21\3\21\3\21\3\21\3\21\3\22\3\22\3\22\3\22\3\22"+
+    "\3\22\3\22\3\22\3\22\3\23\3\23\3\23\3\23\3\23\3\23\3\23\3\23\3\24\3\24"+
+    "\3\24\3\24\3\24\3\24\3\24\3\24\3\25\3\25\3\25\3\25\3\25\3\25\3\25\3\25"+
+    "\3\25\3\25\3\25\3\25\3\25\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26\3\26"+
+    "\3\26\3\26\3\26\3\26\3\27\3\27\3\27\3\27\3\27\3\27\3\27\3\27\3\27\3\27"+
+    "\3\27\3\27\3\27\3\27\3\27\3\27\3\27\3\27\3\30\3\30\3\30\3\30\3\31\3\31"+
+    "\3\31\3\31\3\31\3\32\3\32\3\32\3\32\3\32\3\32\3\33\3\33\3\33\3\33\3\33"+
+    "\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\34\3\35\3\35\3\35\3\35\3\35"+
+    "\3\35\3\35\3\35\3\35\3\36\3\36\3\36\3\36\3\36\3\37\3\37\3\37\3\37\3 \3"+
+    " \3 \3 \3 \3 \3 \3!\3!\3!\3!\3!\3!\3!\3!\3!\3!\3!\3\"\3\"\3\"\3\"\3\""+
+    "\3\"\3\"\3#\3#\3#\3#\3#\3#\3#\3#\3$\3$\3$\3$\3$\3$\3$\3$\3%\3%\3%\3%\3"+
+    "%\3%\3&\3&\3&\3&\3&\3&\3\'\3\'\3\'\3\'\3\'\3\'\3\'\3(\3(\3(\3(\3(\3)\3"+
+    ")\3)\3)\3)\3*\3*\3*\3*\3*\3*\3*\3*\3*\3*\3+\3+\3+\3+\3+\3+\3+\3+\3+\3"+
+    ",\3,\3,\3,\3,\3,\3-\3-\3-\3-\3-\3-\3-\3.\3.\3.\3.\3.\3/\3/\3/\3/\3/\3"+
+    "/\3\60\3\60\3\60\3\61\3\61\3\61\3\61\3\61\3\61\3\62\3\62\3\62\3\62\3\62"+
+    "\3\62\3\62\3\62\3\62\3\63\3\63\3\63\3\64\3\64\3\64\3\64\3\64\3\65\3\65"+
+    "\3\65\3\65\3\65\3\66\3\66\3\66\3\66\3\66\3\67\3\67\3\67\3\67\3\67\38\3"+
+    "8\38\38\38\38\39\39\39\39\39\39\39\3:\3:\3:\3:\3:\3:\3;\3;\3;\3;\3;\3"+
+    ";\3;\3<\3<\3<\3<\3<\3<\3<\3<\3=\3=\3=\3=\3=\3=\3>\3>\3>\3>\3>\3>\3>\3"+
+    "?\3?\3?\3?\3?\3?\3?\3?\3@\3@\3@\3@\3A\3A\3A\3A\3A\3B\3B\3B\3B\3B\3B\3"+
+    "C\3C\3C\3D\3D\3D\3D\3D\3D\3D\3D\3D\3D\3E\3E\3E\3F\3F\3F\3F\3F\3F\3G\3"+
+    "G\3G\3G\3G\3G\3H\3H\3H\3H\3H\3H\3H\3I\3I\3I\3I\3I\3I\3I\3I\3I\3J\3J\3"+
+    "J\3J\3J\3K\3K\3K\3K\3K\3K\3L\3L\3L\3L\3L\3L\3M\3M\3M\3M\3M\3M\3N\3N\3"+
+    "N\3N\3N\3N\3N\3N\3O\3O\3O\3O\3O\3O\3O\3P\3P\3P\3P\3P\3P\3P\3P\3Q\3Q\3"+
+    "Q\3Q\3Q\3Q\3Q\3R\3R\3R\3R\3R\3S\3S\3S\3S\3T\3T\3T\3T\3T\3T\3U\3U\3U\3"+
+    "U\3U\3U\3U\3V\3V\3V\3V\3V\3W\3W\3W\3W\3W\3X\3X\3X\3X\3X\3Y\3Y\3Y\3Z\3"+
+    "Z\3Z\3Z\3Z\3[\3[\3[\3[\3[\3[\3\\\3\\\3\\\3\\\3\\\3\\\3]\3]\3]\3]\3]\3"+
+    "]\3]\3^\3^\3^\3^\3^\3_\3_\3_\3_\3_\3_\3`\3`\3`\3`\3`\3a\3a\3a\3a\3a\3"+
+    "b\3b\3b\3b\3b\3b\3c\3c\3c\3c\3c\3c\3c\3c\3d\3d\3d\3d\3e\3e\3e\3e\3e\3"+
+    "e\3e\3f\3f\3f\3g\3g\3g\3h\3h\3h\3h\3i\3i\3i\3i\3i\3i\3j\3j\3k\3k\3l\3"+
+    "l\3l\3l\3m\3m\3m\3m\5m\u039c\nm\3n\3n\3o\3o\3o\3p\3p\3q\3q\3q\3r\3r\3"+
+    "s\3s\3t\3t\3u\3u\3v\3v\3w\3w\3w\3x\3x\3x\3y\3y\3z\3z\3{\3{\3{\3{\7{\u03c0"+
+    "\n{\f{\16{\u03c3\13{\3{\3{\3|\6|\u03c8\n|\r|\16|\u03c9\3}\6}\u03cd\n}"+
+    "\r}\16}\u03ce\3}\3}\7}\u03d3\n}\f}\16}\u03d6\13}\3}\3}\6}\u03da\n}\r}"+
+    "\16}\u03db\3}\6}\u03df\n}\r}\16}\u03e0\3}\3}\7}\u03e5\n}\f}\16}\u03e8"+
+    "\13}\5}\u03ea\n}\3}\3}\3}\3}\6}\u03f0\n}\r}\16}\u03f1\3}\3}\5}\u03f6\n"+
+    "}\3~\3~\5~\u03fa\n~\3~\3~\3~\7~\u03ff\n~\f~\16~\u0402\13~\3\177\3\177"+
+    "\3\177\3\177\6\177\u0408\n\177\r\177\16\177\u0409\3\u0080\3\u0080\3\u0080"+
+    "\6\u0080\u040f\n\u0080\r\u0080\16\u0080\u0410\3\u0081\3\u0081\3\u0081"+
+    "\3\u0081\7\u0081\u0417\n\u0081\f\u0081\16\u0081\u041a\13\u0081\3\u0081"+
+    "\3\u0081\3\u0082\3\u0082\3\u0082\3\u0082\7\u0082\u0422\n\u0082\f\u0082"+
+    "\16\u0082\u0425\13\u0082\3\u0082\3\u0082\3\u0083\3\u0083\5\u0083\u042b"+
+    "\n\u0083\3\u0083\6\u0083\u042e\n\u0083\r\u0083\16\u0083\u042f\3\u0084"+
+    "\3\u0084\3\u0085\3\u0085\3\u0086\3\u0086\3\u0086\3\u0086\7\u0086\u043a"+
+    "\n\u0086\f\u0086\16\u0086\u043d\13\u0086\3\u0086\5\u0086\u0440\n\u0086"+
+    "\3\u0086\5\u0086\u0443\n\u0086\3\u0086\3\u0086\3\u0087\3\u0087\3\u0087"+
+    "\3\u0087\3\u0087\7\u0087\u044c\n\u0087\f\u0087\16\u0087\u044f\13\u0087"+
+    "\3\u0087\3\u0087\3\u0087\3\u0087\3\u0087\3\u0088\6\u0088\u0457\n\u0088"+
+    "\r\u0088\16\u0088\u0458\3\u0088\3\u0088\3\u0089\3\u0089\3\u044d\2\u008a"+
     "\3\3\5\4\7\5\t\6\13\7\r\b\17\t\21\n\23\13\25\f\27\r\31\16\33\17\35\20"+
     "\37\21!\22#\23%\24\'\25)\26+\27-\30/\31\61\32\63\33\65\34\67\359\36;\37"+
     "= ?!A\"C#E$G%I&K\'M(O)Q*S+U,W-Y.[/]\60_\61a\62c\63e\64g\65i\66k\67m8o"+
@@ -229,302 +239,313 @@ class SqlBaseLexer extends Lexer {
     "\\\u00b7]\u00b9^\u00bb_\u00bd`\u00bfa\u00c1b\u00c3c\u00c5d\u00c7e\u00c9"+
     "f\u00cbg\u00cdh\u00cfi\u00d1j\u00d3k\u00d5l\u00d7m\u00d9n\u00dbo\u00dd"+
     "p\u00dfq\u00e1r\u00e3s\u00e5t\u00e7u\u00e9v\u00ebw\u00edx\u00efy\u00f1"+
-    "z\u00f3{\u00f5|\u00f7}\u00f9~\u00fb\2\u00fd\2\u00ff\2\u0101\177\u0103"+
-    "\u0080\u0105\u0081\u0107\u0082\3\2\13\3\2))\4\2BBaa\3\2$$\3\2bb\4\2--"+
-    "//\3\2\62;\3\2C\\\4\2\f\f\17\17\5\2\13\f\17\17\"\"\u045c\2\3\3\2\2\2\2"+
-    "\5\3\2\2\2\2\7\3\2\2\2\2\t\3\2\2\2\2\13\3\2\2\2\2\r\3\2\2\2\2\17\3\2\2"+
-    "\2\2\21\3\2\2\2\2\23\3\2\2\2\2\25\3\2\2\2\2\27\3\2\2\2\2\31\3\2\2\2\2"+
-    "\33\3\2\2\2\2\35\3\2\2\2\2\37\3\2\2\2\2!\3\2\2\2\2#\3\2\2\2\2%\3\2\2\2"+
-    "\2\'\3\2\2\2\2)\3\2\2\2\2+\3\2\2\2\2-\3\2\2\2\2/\3\2\2\2\2\61\3\2\2\2"+
-    "\2\63\3\2\2\2\2\65\3\2\2\2\2\67\3\2\2\2\29\3\2\2\2\2;\3\2\2\2\2=\3\2\2"+
-    "\2\2?\3\2\2\2\2A\3\2\2\2\2C\3\2\2\2\2E\3\2\2\2\2G\3\2\2\2\2I\3\2\2\2\2"+
-    "K\3\2\2\2\2M\3\2\2\2\2O\3\2\2\2\2Q\3\2\2\2\2S\3\2\2\2\2U\3\2\2\2\2W\3"+
-    "\2\2\2\2Y\3\2\2\2\2[\3\2\2\2\2]\3\2\2\2\2_\3\2\2\2\2a\3\2\2\2\2c\3\2\2"+
-    "\2\2e\3\2\2\2\2g\3\2\2\2\2i\3\2\2\2\2k\3\2\2\2\2m\3\2\2\2\2o\3\2\2\2\2"+
-    "q\3\2\2\2\2s\3\2\2\2\2u\3\2\2\2\2w\3\2\2\2\2y\3\2\2\2\2{\3\2\2\2\2}\3"+
-    "\2\2\2\2\177\3\2\2\2\2\u0081\3\2\2\2\2\u0083\3\2\2\2\2\u0085\3\2\2\2\2"+
-    "\u0087\3\2\2\2\2\u0089\3\2\2\2\2\u008b\3\2\2\2\2\u008d\3\2\2\2\2\u008f"+
-    "\3\2\2\2\2\u0091\3\2\2\2\2\u0093\3\2\2\2\2\u0095\3\2\2\2\2\u0097\3\2\2"+
-    "\2\2\u0099\3\2\2\2\2\u009b\3\2\2\2\2\u009d\3\2\2\2\2\u009f\3\2\2\2\2\u00a1"+
-    "\3\2\2\2\2\u00a3\3\2\2\2\2\u00a5\3\2\2\2\2\u00a7\3\2\2\2\2\u00a9\3\2\2"+
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-    "\3\2\2\2\2\u00b5\3\2\2\2\2\u00b7\3\2\2\2\2\u00b9\3\2\2\2\2\u00bb\3\2\2"+
-    "\2\2\u00bd\3\2\2\2\2\u00bf\3\2\2\2\2\u00c1\3\2\2\2\2\u00c3\3\2\2\2\2\u00c5"+
-    "\3\2\2\2\2\u00c7\3\2\2\2\2\u00c9\3\2\2\2\2\u00cb\3\2\2\2\2\u00cd\3\2\2"+
-    "\2\2\u00cf\3\2\2\2\2\u00d1\3\2\2\2\2\u00d3\3\2\2\2\2\u00d5\3\2\2\2\2\u00d7"+
-    "\3\2\2\2\2\u00d9\3\2\2\2\2\u00db\3\2\2\2\2\u00dd\3\2\2\2\2\u00df\3\2\2"+
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-    "\3\2\2\2\2\u00eb\3\2\2\2\2\u00ed\3\2\2\2\2\u00ef\3\2\2\2\2\u00f1\3\2\2"+
-    "\2\2\u00f3\3\2\2\2\2\u00f5\3\2\2\2\2\u00f7\3\2\2\2\2\u00f9\3\2\2\2\2\u0101"+
-    "\3\2\2\2\2\u0103\3\2\2\2\2\u0105\3\2\2\2\2\u0107\3\2\2\2\3\u0109\3\2\2"+
-    "\2\5\u010b\3\2\2\2\7\u010d\3\2\2\2\t\u010f\3\2\2\2\13\u0111\3\2\2\2\r"+
-    "\u0115\3\2\2\2\17\u011d\3\2\2\2\21\u0126\3\2\2\2\23\u012a\3\2\2\2\25\u012e"+
-    "\3\2\2\2\27\u0131\3\2\2\2\31\u0135\3\2\2\2\33\u013d\3\2\2\2\35\u0140\3"+
-    "\2\2\2\37\u0145\3\2\2\2!\u014d\3\2\2\2#\u0156\3\2\2\2%\u015e\3\2\2\2\'"+
-    "\u0166\3\2\2\2)\u0173\3\2\2\2+\u0180\3\2\2\2-\u0192\3\2\2\2/\u0196\3\2"+
-    "\2\2\61\u019b\3\2\2\2\63\u01a1\3\2\2\2\65\u01a6\3\2\2\2\67\u01af\3\2\2"+
-    "\29\u01b8\3\2\2\2;\u01bf\3\2\2\2=\u01ca\3\2\2\2?\u01d1\3\2\2\2A\u01d9"+
-    "\3\2\2\2C\u01e1\3\2\2\2E\u01e7\3\2\2\2G\u01ed\3\2\2\2I\u01f4\3\2\2\2K"+
-    "\u01f9\3\2\2\2M\u01fe\3\2\2\2O\u0208\3\2\2\2Q\u0211\3\2\2\2S\u0217\3\2"+
-    "\2\2U\u021e\3\2\2\2W\u0223\3\2\2\2Y\u0229\3\2\2\2[\u022c\3\2\2\2]\u0232"+
-    "\3\2\2\2_\u023b\3\2\2\2a\u023e\3\2\2\2c\u0243\3\2\2\2e\u0248\3\2\2\2g"+
-    "\u024d\3\2\2\2i\u0252\3\2\2\2k\u0258\3\2\2\2m\u025f\3\2\2\2o\u0265\3\2"+
-    "\2\2q\u026c\3\2\2\2s\u0274\3\2\2\2u\u027a\3\2\2\2w\u0281\3\2\2\2y\u0289"+
-    "\3\2\2\2{\u028d\3\2\2\2}\u0292\3\2\2\2\177\u0298\3\2\2\2\u0081\u029b\3"+
-    "\2\2\2\u0083\u02a5\3\2\2\2\u0085\u02a8\3\2\2\2\u0087\u02ae\3\2\2\2\u0089"+
-    "\u02b4\3\2\2\2\u008b\u02bb\3\2\2\2\u008d\u02c4\3\2\2\2\u008f\u02c9\3\2"+
-    "\2\2\u0091\u02cf\3\2\2\2\u0093\u02d5\3\2\2\2\u0095\u02db\3\2\2\2\u0097"+
-    "\u02e3\3\2\2\2\u0099\u02ea\3\2\2\2\u009b\u02f2\3\2\2\2\u009d\u02f9\3\2"+
-    "\2\2\u009f\u02fe\3\2\2\2\u00a1\u0302\3\2\2\2\u00a3\u0308\3\2\2\2\u00a5"+
-    "\u030f\3\2\2\2\u00a7\u0314\3\2\2\2\u00a9\u0319\3\2\2\2\u00ab\u031c\3\2"+
-    "\2\2\u00ad\u0321\3\2\2\2\u00af\u0327\3\2\2\2\u00b1\u032d\3\2\2\2\u00b3"+
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+    "\5\u00f1y\2\u03ee\u03f0\5\u0107\u0084\2\u03ef\u03ee\3\2\2\2\u03f0\u03f1"+
+    "\3\2\2\2\u03f1\u03ef\3\2\2\2\u03f1\u03f2\3\2\2\2\u03f2\u03f3\3\2\2\2\u03f3"+
+    "\u03f4\5\u0105\u0083\2\u03f4\u03f6\3\2\2\2\u03f5\u03cc\3\2\2\2\u03f5\u03d7"+
+    "\3\2\2\2\u03f5\u03de\3\2\2\2\u03f5\u03ed\3\2\2\2\u03f6\u00fa\3\2\2\2\u03f7"+
+    "\u03fa\5\u0109\u0085\2\u03f8\u03fa\7a\2\2\u03f9\u03f7\3\2\2\2\u03f9\u03f8"+
+    "\3\2\2\2\u03fa\u0400\3\2\2\2\u03fb\u03ff\5\u0109\u0085\2\u03fc\u03ff\5"+
+    "\u0107\u0084\2\u03fd\u03ff\t\3\2\2\u03fe\u03fb\3\2\2\2\u03fe\u03fc\3\2"+
+    "\2\2\u03fe\u03fd\3\2\2\2\u03ff\u0402\3\2\2\2\u0400\u03fe\3\2\2\2\u0400"+
+    "\u0401\3\2\2\2\u0401\u00fc\3\2\2\2\u0402\u0400\3\2\2\2\u0403\u0407\5\u0107"+
+    "\u0084\2\u0404\u0408\5\u0109\u0085\2\u0405\u0408\5\u0107\u0084\2\u0406"+
+    "\u0408\t\3\2\2\u0407\u0404\3\2\2\2\u0407\u0405\3\2\2\2\u0407\u0406\3\2"+
+    "\2\2\u0408\u0409\3\2\2\2\u0409\u0407\3\2\2\2\u0409\u040a\3\2\2\2\u040a"+
+    "\u00fe\3\2\2\2\u040b\u040f\5\u0109\u0085\2\u040c\u040f\5\u0107\u0084\2"+
+    "\u040d\u040f\7a\2\2\u040e\u040b\3\2\2\2\u040e\u040c\3\2\2\2\u040e\u040d"+
+    "\3\2\2\2\u040f\u0410\3\2\2\2\u0410\u040e\3\2\2\2\u0410\u0411\3\2\2\2\u0411"+
+    "\u0100\3\2\2\2\u0412\u0418\7$\2\2\u0413\u0417\n\4\2\2\u0414\u0415\7$\2"+
+    "\2\u0415\u0417\7$\2\2\u0416\u0413\3\2\2\2\u0416\u0414\3\2\2\2\u0417\u041a"+
+    "\3\2\2\2\u0418\u0416\3\2\2\2\u0418\u0419\3\2\2\2\u0419\u041b\3\2\2\2\u041a"+
+    "\u0418\3\2\2\2\u041b\u041c\7$\2\2\u041c\u0102\3\2\2\2\u041d\u0423\7b\2"+
+    "\2\u041e\u0422\n\5\2\2\u041f\u0420\7b\2\2\u0420\u0422\7b\2\2\u0421\u041e"+
+    "\3\2\2\2\u0421\u041f\3\2\2\2\u0422\u0425\3\2\2\2\u0423\u0421\3\2\2\2\u0423"+
+    "\u0424\3\2\2\2\u0424\u0426\3\2\2\2\u0425\u0423\3\2\2\2\u0426\u0427\7b"+
+    "\2\2\u0427\u0104\3\2\2\2\u0428\u042a\7G\2\2\u0429\u042b\t\6\2\2\u042a"+
+    "\u0429\3\2\2\2\u042a\u042b\3\2\2\2\u042b\u042d\3\2\2\2\u042c\u042e\5\u0107"+
+    "\u0084\2\u042d\u042c\3\2\2\2\u042e\u042f\3\2\2\2\u042f\u042d\3\2\2\2\u042f"+
+    "\u0430\3\2\2\2\u0430\u0106\3\2\2\2\u0431\u0432\t\7\2\2\u0432\u0108\3\2"+
+    "\2\2\u0433\u0434\t\b\2\2\u0434\u010a\3\2\2\2\u0435\u0436\7/\2\2\u0436"+
+    "\u0437\7/\2\2\u0437\u043b\3\2\2\2\u0438\u043a\n\t\2\2\u0439\u0438\3\2"+
+    "\2\2\u043a\u043d\3\2\2\2\u043b\u0439\3\2\2\2\u043b\u043c\3\2\2\2\u043c"+
+    "\u043f\3\2\2\2\u043d\u043b\3\2\2\2\u043e\u0440\7\17\2\2\u043f\u043e\3"+
+    "\2\2\2\u043f\u0440\3\2\2\2\u0440\u0442\3\2\2\2\u0441\u0443\7\f\2\2\u0442"+
+    "\u0441\3\2\2\2\u0442\u0443\3\2\2\2\u0443\u0444\3\2\2\2\u0444\u0445\b\u0086"+
+    "\2\2\u0445\u010c\3\2\2\2\u0446\u0447\7\61\2\2\u0447\u0448\7,\2\2\u0448"+
+    "\u044d\3\2\2\2\u0449\u044c\5\u010d\u0087\2\u044a\u044c\13\2\2\2\u044b"+
+    "\u0449\3\2\2\2\u044b\u044a\3\2\2\2\u044c\u044f\3\2\2\2\u044d\u044e\3\2"+
+    "\2\2\u044d\u044b\3\2\2\2\u044e\u0450\3\2\2\2\u044f\u044d\3\2\2\2\u0450"+
+    "\u0451\7,\2\2\u0451\u0452\7\61\2\2\u0452\u0453\3\2\2\2\u0453\u0454\b\u0087"+
+    "\2\2\u0454\u010e\3\2\2\2\u0455\u0457\t\n\2\2\u0456\u0455\3\2\2\2\u0457"+
+    "\u0458\3\2\2\2\u0458\u0456\3\2\2\2\u0458\u0459\3\2\2\2\u0459\u045a\3\2"+
+    "\2\2\u045a\u045b\b\u0088\2\2\u045b\u0110\3\2\2\2\u045c\u045d\13\2\2\2"+
+    "\u045d\u0112\3\2\2\2\"\2\u039b\u03bf\u03c1\u03c9\u03ce\u03d4\u03db\u03e0"+
+    "\u03e6\u03e9\u03f1\u03f5\u03f9\u03fe\u0400\u0407\u0409\u040e\u0410\u0416"+
+    "\u0418\u0421\u0423\u042a\u042f\u043b\u043f\u0442\u044b\u044d\u0458\3\2"+
+    "\3\2";
   public static final ATN _ATN =
     new ATNDeserializer().deserialize(_serializedATN.toCharArray());
   static {
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseListener.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseListener.java
index 9d9bc1a23c0..c0845b7adb5 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseListener.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseListener.java
@@ -693,6 +693,18 @@ interface SqlBaseListener extends ParseTreeListener {
    * @param ctx the parse tree
    */
   void exitSubqueryExpression(SqlBaseParser.SubqueryExpressionContext ctx);
+  /**
+   * Enter a parse tree produced by the {@code case}
+   * labeled alternative in {@link SqlBaseParser#primaryExpression}.
+   * @param ctx the parse tree
+   */
+  void enterCase(SqlBaseParser.CaseContext ctx);
+  /**
+   * Exit a parse tree produced by the {@code case}
+   * labeled alternative in {@link SqlBaseParser#primaryExpression}.
+   * @param ctx the parse tree
+   */
+  void exitCase(SqlBaseParser.CaseContext ctx);
   /**
    * Enter a parse tree produced by {@link SqlBaseParser#builtinDateTimeFunction}.
    * @param ctx the parse tree
@@ -1067,6 +1079,16 @@ interface SqlBaseListener extends ParseTreeListener {
    * @param ctx the parse tree
    */
   void exitString(SqlBaseParser.StringContext ctx);
+  /**
+   * Enter a parse tree produced by {@link SqlBaseParser#whenClause}.
+   * @param ctx the parse tree
+   */
+  void enterWhenClause(SqlBaseParser.WhenClauseContext ctx);
+  /**
+   * Exit a parse tree produced by {@link SqlBaseParser#whenClause}.
+   * @param ctx the parse tree
+   */
+  void exitWhenClause(SqlBaseParser.WhenClauseContext ctx);
   /**
    * Enter a parse tree produced by {@link SqlBaseParser#nonReserved}.
    * @param ctx the parse tree
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java
index 6769cc88695..1ae31755226 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseParser.java
@@ -32,25 +32,25 @@ class SqlBaseParser extends Parser {
     new PredictionContextCache();
   public static final int
     T__0=1, T__1=2, T__2=3, T__3=4, ALL=5, ANALYZE=6, ANALYZED=7, AND=8, ANY=9, 
-    AS=10, ASC=11, BETWEEN=12, BY=13, CAST=14, CATALOG=15, CATALOGS=16, COLUMNS=17, 
-    CONVERT=18, CURRENT_DATE=19, CURRENT_TIME=20, CURRENT_TIMESTAMP=21, DAY=22, 
-    DAYS=23, DEBUG=24, DESC=25, DESCRIBE=26, DISTINCT=27, ESCAPE=28, EXECUTABLE=29, 
-    EXISTS=30, EXPLAIN=31, EXTRACT=32, FALSE=33, FIRST=34, FORMAT=35, FROM=36, 
-    FULL=37, FUNCTIONS=38, GRAPHVIZ=39, GROUP=40, HAVING=41, HOUR=42, HOURS=43, 
-    IN=44, INNER=45, INTERVAL=46, IS=47, JOIN=48, LAST=49, LEFT=50, LIKE=51, 
-    LIMIT=52, MAPPED=53, MATCH=54, MINUTE=55, MINUTES=56, MONTH=57, MONTHS=58, 
-    NATURAL=59, NOT=60, NULL=61, NULLS=62, ON=63, OPTIMIZED=64, OR=65, ORDER=66, 
-    OUTER=67, PARSED=68, PHYSICAL=69, PLAN=70, RIGHT=71, RLIKE=72, QUERY=73, 
-    SCHEMAS=74, SECOND=75, SECONDS=76, SELECT=77, SHOW=78, SYS=79, TABLE=80, 
-    TABLES=81, TEXT=82, TRUE=83, TO=84, TYPE=85, TYPES=86, USING=87, VERIFY=88, 
-    WHERE=89, WITH=90, YEAR=91, YEARS=92, ESCAPE_ESC=93, FUNCTION_ESC=94, 
-    LIMIT_ESC=95, DATE_ESC=96, TIME_ESC=97, TIMESTAMP_ESC=98, GUID_ESC=99, 
-    ESC_END=100, EQ=101, NULLEQ=102, NEQ=103, LT=104, LTE=105, GT=106, GTE=107, 
-    PLUS=108, MINUS=109, ASTERISK=110, SLASH=111, PERCENT=112, CAST_OP=113, 
-    CONCAT=114, DOT=115, PARAM=116, STRING=117, INTEGER_VALUE=118, DECIMAL_VALUE=119, 
-    IDENTIFIER=120, DIGIT_IDENTIFIER=121, TABLE_IDENTIFIER=122, QUOTED_IDENTIFIER=123, 
-    BACKQUOTED_IDENTIFIER=124, SIMPLE_COMMENT=125, BRACKETED_COMMENT=126, 
-    WS=127, UNRECOGNIZED=128, DELIMITER=129;
+    AS=10, ASC=11, BETWEEN=12, BY=13, CASE=14, CAST=15, CATALOG=16, CATALOGS=17, 
+    COLUMNS=18, CONVERT=19, CURRENT_DATE=20, CURRENT_TIME=21, CURRENT_TIMESTAMP=22, 
+    DAY=23, DAYS=24, DEBUG=25, DESC=26, DESCRIBE=27, DISTINCT=28, ELSE=29, 
+    END=30, ESCAPE=31, EXECUTABLE=32, EXISTS=33, EXPLAIN=34, EXTRACT=35, FALSE=36, 
+    FIRST=37, FORMAT=38, FROM=39, FULL=40, FUNCTIONS=41, GRAPHVIZ=42, GROUP=43, 
+    HAVING=44, HOUR=45, HOURS=46, IN=47, INNER=48, INTERVAL=49, IS=50, JOIN=51, 
+    LAST=52, LEFT=53, LIKE=54, LIMIT=55, MAPPED=56, MATCH=57, MINUTE=58, MINUTES=59, 
+    MONTH=60, MONTHS=61, NATURAL=62, NOT=63, NULL=64, NULLS=65, ON=66, OPTIMIZED=67, 
+    OR=68, ORDER=69, OUTER=70, PARSED=71, PHYSICAL=72, PLAN=73, RIGHT=74, 
+    RLIKE=75, QUERY=76, SCHEMAS=77, SECOND=78, SECONDS=79, SELECT=80, SHOW=81, 
+    SYS=82, TABLE=83, TABLES=84, TEXT=85, THEN=86, TRUE=87, TO=88, TYPE=89, 
+    TYPES=90, USING=91, VERIFY=92, WHEN=93, WHERE=94, WITH=95, YEAR=96, YEARS=97, 
+    ESCAPE_ESC=98, FUNCTION_ESC=99, LIMIT_ESC=100, DATE_ESC=101, TIME_ESC=102, 
+    TIMESTAMP_ESC=103, GUID_ESC=104, ESC_END=105, EQ=106, NULLEQ=107, NEQ=108, 
+    LT=109, LTE=110, GT=111, GTE=112, PLUS=113, MINUS=114, ASTERISK=115, SLASH=116, 
+    PERCENT=117, CAST_OP=118, CONCAT=119, DOT=120, PARAM=121, STRING=122, 
+    INTEGER_VALUE=123, DECIMAL_VALUE=124, IDENTIFIER=125, DIGIT_IDENTIFIER=126, 
+    TABLE_IDENTIFIER=127, QUOTED_IDENTIFIER=128, BACKQUOTED_IDENTIFIER=129, 
+    SIMPLE_COMMENT=130, BRACKETED_COMMENT=131, WS=132, UNRECOGNIZED=133, DELIMITER=134;
   public static final int
     RULE_singleStatement = 0, RULE_singleExpression = 1, RULE_statement = 2, 
     RULE_query = 3, RULE_queryNoWith = 4, RULE_limitClause = 5, RULE_queryTerm = 6, 
@@ -67,7 +67,8 @@ class SqlBaseParser extends Parser {
     RULE_constant = 40, RULE_comparisonOperator = 41, RULE_booleanValue = 42, 
     RULE_interval = 43, RULE_intervalField = 44, RULE_dataType = 45, RULE_qualifiedName = 46, 
     RULE_identifier = 47, RULE_tableIdentifier = 48, RULE_quoteIdentifier = 49, 
-    RULE_unquoteIdentifier = 50, RULE_number = 51, RULE_string = 52, RULE_nonReserved = 53;
+    RULE_unquoteIdentifier = 50, RULE_number = 51, RULE_string = 52, RULE_whenClause = 53, 
+    RULE_nonReserved = 54;
   public static final String[] ruleNames = {
     "singleStatement", "singleExpression", "statement", "query", "queryNoWith", 
     "limitClause", "queryTerm", "orderBy", "querySpecification", "fromClause", 
@@ -80,47 +81,48 @@ class SqlBaseParser extends Parser {
     "functionExpression", "functionTemplate", "functionName", "constant", 
     "comparisonOperator", "booleanValue", "interval", "intervalField", "dataType", 
     "qualifiedName", "identifier", "tableIdentifier", "quoteIdentifier", "unquoteIdentifier", 
-    "number", "string", "nonReserved"
+    "number", "string", "whenClause", "nonReserved"
   };
 
   private static final String[] _LITERAL_NAMES = {
     null, "'('", "')'", "','", "':'", "'ALL'", "'ANALYZE'", "'ANALYZED'", 
-    "'AND'", "'ANY'", "'AS'", "'ASC'", "'BETWEEN'", "'BY'", "'CAST'", "'CATALOG'", 
-    "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT_DATE'", "'CURRENT_TIME'", 
-    "'CURRENT_TIMESTAMP'", "'DAY'", "'DAYS'", "'DEBUG'", "'DESC'", "'DESCRIBE'", 
-    "'DISTINCT'", "'ESCAPE'", "'EXECUTABLE'", "'EXISTS'", "'EXPLAIN'", "'EXTRACT'", 
-    "'FALSE'", "'FIRST'", "'FORMAT'", "'FROM'", "'FULL'", "'FUNCTIONS'", "'GRAPHVIZ'", 
-    "'GROUP'", "'HAVING'", "'HOUR'", "'HOURS'", "'IN'", "'INNER'", "'INTERVAL'", 
-    "'IS'", "'JOIN'", "'LAST'", "'LEFT'", "'LIKE'", "'LIMIT'", "'MAPPED'", 
-    "'MATCH'", "'MINUTE'", "'MINUTES'", "'MONTH'", "'MONTHS'", "'NATURAL'", 
-    "'NOT'", "'NULL'", "'NULLS'", "'ON'", "'OPTIMIZED'", "'OR'", "'ORDER'", 
-    "'OUTER'", "'PARSED'", "'PHYSICAL'", "'PLAN'", "'RIGHT'", "'RLIKE'", "'QUERY'", 
-    "'SCHEMAS'", "'SECOND'", "'SECONDS'", "'SELECT'", "'SHOW'", "'SYS'", "'TABLE'", 
-    "'TABLES'", "'TEXT'", "'TRUE'", "'TO'", "'TYPE'", "'TYPES'", "'USING'", 
-    "'VERIFY'", "'WHERE'", "'WITH'", "'YEAR'", "'YEARS'", "'{ESCAPE'", "'{FN'", 
-    "'{LIMIT'", "'{D'", "'{T'", "'{TS'", "'{GUID'", "'}'", "'='", "'<=>'", 
-    null, "'<'", "'<='", "'>'", "'>='", "'+'", "'-'", "'*'", "'/'", "'%'", 
-    "'::'", "'||'", "'.'", "'?'"
+    "'AND'", "'ANY'", "'AS'", "'ASC'", "'BETWEEN'", "'BY'", "'CASE'", "'CAST'", 
+    "'CATALOG'", "'CATALOGS'", "'COLUMNS'", "'CONVERT'", "'CURRENT_DATE'", 
+    "'CURRENT_TIME'", "'CURRENT_TIMESTAMP'", "'DAY'", "'DAYS'", "'DEBUG'", 
+    "'DESC'", "'DESCRIBE'", "'DISTINCT'", "'ELSE'", "'END'", "'ESCAPE'", "'EXECUTABLE'", 
+    "'EXISTS'", "'EXPLAIN'", "'EXTRACT'", "'FALSE'", "'FIRST'", "'FORMAT'", 
+    "'FROM'", "'FULL'", "'FUNCTIONS'", "'GRAPHVIZ'", "'GROUP'", "'HAVING'", 
+    "'HOUR'", "'HOURS'", "'IN'", "'INNER'", "'INTERVAL'", "'IS'", "'JOIN'", 
+    "'LAST'", "'LEFT'", "'LIKE'", "'LIMIT'", "'MAPPED'", "'MATCH'", "'MINUTE'", 
+    "'MINUTES'", "'MONTH'", "'MONTHS'", "'NATURAL'", "'NOT'", "'NULL'", "'NULLS'", 
+    "'ON'", "'OPTIMIZED'", "'OR'", "'ORDER'", "'OUTER'", "'PARSED'", "'PHYSICAL'", 
+    "'PLAN'", "'RIGHT'", "'RLIKE'", "'QUERY'", "'SCHEMAS'", "'SECOND'", "'SECONDS'", 
+    "'SELECT'", "'SHOW'", "'SYS'", "'TABLE'", "'TABLES'", "'TEXT'", "'THEN'", 
+    "'TRUE'", "'TO'", "'TYPE'", "'TYPES'", "'USING'", "'VERIFY'", "'WHEN'", 
+    "'WHERE'", "'WITH'", "'YEAR'", "'YEARS'", "'{ESCAPE'", "'{FN'", "'{LIMIT'", 
+    "'{D'", "'{T'", "'{TS'", "'{GUID'", "'}'", "'='", "'<=>'", null, "'<'", 
+    "'<='", "'>'", "'>='", "'+'", "'-'", "'*'", "'/'", "'%'", "'::'", "'||'", 
+    "'.'", "'?'"
   };
   private static final String[] _SYMBOLIC_NAMES = {
     null, null, null, null, null, "ALL", "ANALYZE", "ANALYZED", "AND", "ANY", 
-    "AS", "ASC", "BETWEEN", "BY", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
+    "AS", "ASC", "BETWEEN", "BY", "CASE", "CAST", "CATALOG", "CATALOGS", "COLUMNS", 
     "CONVERT", "CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", "DAY", 
-    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ESCAPE", "EXECUTABLE", 
-    "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", "FROM", "FULL", 
-    "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", "IN", "INNER", 
-    "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", "MAPPED", "MATCH", 
-    "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", "NOT", "NULL", "NULLS", 
-    "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", "PHYSICAL", "PLAN", 
-    "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", "SELECT", "SHOW", 
-    "SYS", "TABLE", "TABLES", "TEXT", "TRUE", "TO", "TYPE", "TYPES", "USING", 
-    "VERIFY", "WHERE", "WITH", "YEAR", "YEARS", "ESCAPE_ESC", "FUNCTION_ESC", 
-    "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", "GUID_ESC", "ESC_END", 
-    "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", "PLUS", "MINUS", "ASTERISK", 
-    "SLASH", "PERCENT", "CAST_OP", "CONCAT", "DOT", "PARAM", "STRING", "INTEGER_VALUE", 
-    "DECIMAL_VALUE", "IDENTIFIER", "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", 
-    "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", "SIMPLE_COMMENT", "BRACKETED_COMMENT", 
-    "WS", "UNRECOGNIZED", "DELIMITER"
+    "DAYS", "DEBUG", "DESC", "DESCRIBE", "DISTINCT", "ELSE", "END", "ESCAPE", 
+    "EXECUTABLE", "EXISTS", "EXPLAIN", "EXTRACT", "FALSE", "FIRST", "FORMAT", 
+    "FROM", "FULL", "FUNCTIONS", "GRAPHVIZ", "GROUP", "HAVING", "HOUR", "HOURS", 
+    "IN", "INNER", "INTERVAL", "IS", "JOIN", "LAST", "LEFT", "LIKE", "LIMIT", 
+    "MAPPED", "MATCH", "MINUTE", "MINUTES", "MONTH", "MONTHS", "NATURAL", 
+    "NOT", "NULL", "NULLS", "ON", "OPTIMIZED", "OR", "ORDER", "OUTER", "PARSED", 
+    "PHYSICAL", "PLAN", "RIGHT", "RLIKE", "QUERY", "SCHEMAS", "SECOND", "SECONDS", 
+    "SELECT", "SHOW", "SYS", "TABLE", "TABLES", "TEXT", "THEN", "TRUE", "TO", 
+    "TYPE", "TYPES", "USING", "VERIFY", "WHEN", "WHERE", "WITH", "YEAR", "YEARS", 
+    "ESCAPE_ESC", "FUNCTION_ESC", "LIMIT_ESC", "DATE_ESC", "TIME_ESC", "TIMESTAMP_ESC", 
+    "GUID_ESC", "ESC_END", "EQ", "NULLEQ", "NEQ", "LT", "LTE", "GT", "GTE", 
+    "PLUS", "MINUS", "ASTERISK", "SLASH", "PERCENT", "CAST_OP", "CONCAT", 
+    "DOT", "PARAM", "STRING", "INTEGER_VALUE", "DECIMAL_VALUE", "IDENTIFIER", 
+    "DIGIT_IDENTIFIER", "TABLE_IDENTIFIER", "QUOTED_IDENTIFIER", "BACKQUOTED_IDENTIFIER", 
+    "SIMPLE_COMMENT", "BRACKETED_COMMENT", "WS", "UNRECOGNIZED", "DELIMITER"
   };
   public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -201,9 +203,9 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(108);
+      setState(110);
       statement();
-      setState(109);
+      setState(111);
       match(EOF);
       }
     }
@@ -248,9 +250,9 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(111);
+      setState(113);
       expression();
-      setState(112);
+      setState(114);
       match(EOF);
       }
     }
@@ -613,14 +615,14 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 4, RULE_statement);
     int _la;
     try {
-      setState(215);
+      setState(217);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,19,_ctx) ) {
       case 1:
         _localctx = new StatementDefaultContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(114);
+        setState(116);
         query();
         }
         break;
@@ -628,30 +630,30 @@ class SqlBaseParser extends Parser {
         _localctx = new ExplainContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(115);
+        setState(117);
         match(EXPLAIN);
-        setState(129);
+        setState(131);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,2,_ctx) ) {
         case 1:
           {
-          setState(116);
+          setState(118);
           match(T__0);
-          setState(125);
+          setState(127);
           _errHandler.sync(this);
           _la = _input.LA(1);
-          while (((((_la - 35)) & ~0x3f) == 0 && ((1L << (_la - 35)) & ((1L << (FORMAT - 35)) | (1L << (PLAN - 35)) | (1L << (VERIFY - 35)))) != 0)) {
+          while (((((_la - 38)) & ~0x3f) == 0 && ((1L << (_la - 38)) & ((1L << (FORMAT - 38)) | (1L << (PLAN - 38)) | (1L << (VERIFY - 38)))) != 0)) {
             {
-            setState(123);
+            setState(125);
             switch (_input.LA(1)) {
             case PLAN:
               {
-              setState(117);
+              setState(119);
               match(PLAN);
-              setState(118);
+              setState(120);
               ((ExplainContext)_localctx).type = _input.LT(1);
               _la = _input.LA(1);
-              if ( !(((((_la - 5)) & ~0x3f) == 0 && ((1L << (_la - 5)) & ((1L << (ALL - 5)) | (1L << (ANALYZED - 5)) | (1L << (EXECUTABLE - 5)) | (1L << (MAPPED - 5)) | (1L << (OPTIMIZED - 5)) | (1L << (PARSED - 5)))) != 0)) ) {
+              if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ALL) | (1L << ANALYZED) | (1L << EXECUTABLE) | (1L << MAPPED))) != 0) || _la==OPTIMIZED || _la==PARSED) ) {
                 ((ExplainContext)_localctx).type = (Token)_errHandler.recoverInline(this);
               } else {
                 consume();
@@ -660,9 +662,9 @@ class SqlBaseParser extends Parser {
               break;
             case FORMAT:
               {
-              setState(119);
+              setState(121);
               match(FORMAT);
-              setState(120);
+              setState(122);
               ((ExplainContext)_localctx).format = _input.LT(1);
               _la = _input.LA(1);
               if ( !(_la==GRAPHVIZ || _la==TEXT) ) {
@@ -674,9 +676,9 @@ class SqlBaseParser extends Parser {
               break;
             case VERIFY:
               {
-              setState(121);
+              setState(123);
               match(VERIFY);
-              setState(122);
+              setState(124);
               ((ExplainContext)_localctx).verify = booleanValue();
               }
               break;
@@ -684,16 +686,16 @@ class SqlBaseParser extends Parser {
               throw new NoViableAltException(this);
             }
             }
-            setState(127);
+            setState(129);
             _errHandler.sync(this);
             _la = _input.LA(1);
           }
-          setState(128);
+          setState(130);
           match(T__1);
           }
           break;
         }
-        setState(131);
+        setState(133);
         statement();
         }
         break;
@@ -701,27 +703,27 @@ class SqlBaseParser extends Parser {
         _localctx = new DebugContext(_localctx);
         enterOuterAlt(_localctx, 3);
         {
-        setState(132);
+        setState(134);
         match(DEBUG);
-        setState(144);
+        setState(146);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,5,_ctx) ) {
         case 1:
           {
-          setState(133);
+          setState(135);
           match(T__0);
-          setState(140);
+          setState(142);
           _errHandler.sync(this);
           _la = _input.LA(1);
           while (_la==FORMAT || _la==PLAN) {
             {
-            setState(138);
+            setState(140);
             switch (_input.LA(1)) {
             case PLAN:
               {
-              setState(134);
+              setState(136);
               match(PLAN);
-              setState(135);
+              setState(137);
               ((DebugContext)_localctx).type = _input.LT(1);
               _la = _input.LA(1);
               if ( !(_la==ANALYZED || _la==OPTIMIZED) ) {
@@ -733,9 +735,9 @@ class SqlBaseParser extends Parser {
               break;
             case FORMAT:
               {
-              setState(136);
+              setState(138);
               match(FORMAT);
-              setState(137);
+              setState(139);
               ((DebugContext)_localctx).format = _input.LT(1);
               _la = _input.LA(1);
               if ( !(_la==GRAPHVIZ || _la==TEXT) ) {
@@ -749,16 +751,16 @@ class SqlBaseParser extends Parser {
               throw new NoViableAltException(this);
             }
             }
-            setState(142);
+            setState(144);
             _errHandler.sync(this);
             _la = _input.LA(1);
           }
-          setState(143);
+          setState(145);
           match(T__1);
           }
           break;
         }
-        setState(146);
+        setState(148);
         statement();
         }
         break;
@@ -766,15 +768,15 @@ class SqlBaseParser extends Parser {
         _localctx = new ShowTablesContext(_localctx);
         enterOuterAlt(_localctx, 4);
         {
-        setState(147);
+        setState(149);
         match(SHOW);
-        setState(148);
+        setState(150);
         match(TABLES);
-        setState(151);
+        setState(153);
         switch (_input.LA(1)) {
         case LIKE:
           {
-          setState(149);
+          setState(151);
           ((ShowTablesContext)_localctx).tableLike = likePattern();
           }
           break;
@@ -823,7 +825,7 @@ class SqlBaseParser extends Parser {
         case QUOTED_IDENTIFIER:
         case BACKQUOTED_IDENTIFIER:
           {
-          setState(150);
+          setState(152);
           ((ShowTablesContext)_localctx).tableIdent = tableIdentifier();
           }
           break;
@@ -838,22 +840,22 @@ class SqlBaseParser extends Parser {
         _localctx = new ShowColumnsContext(_localctx);
         enterOuterAlt(_localctx, 5);
         {
-        setState(153);
-        match(SHOW);
-        setState(154);
-        match(COLUMNS);
         setState(155);
+        match(SHOW);
+        setState(156);
+        match(COLUMNS);
+        setState(157);
         _la = _input.LA(1);
         if ( !(_la==FROM || _la==IN) ) {
         _errHandler.recoverInline(this);
         } else {
           consume();
         }
-        setState(158);
+        setState(160);
         switch (_input.LA(1)) {
         case LIKE:
           {
-          setState(156);
+          setState(158);
           ((ShowColumnsContext)_localctx).tableLike = likePattern();
           }
           break;
@@ -902,7 +904,7 @@ class SqlBaseParser extends Parser {
         case QUOTED_IDENTIFIER:
         case BACKQUOTED_IDENTIFIER:
           {
-          setState(157);
+          setState(159);
           ((ShowColumnsContext)_localctx).tableIdent = tableIdentifier();
           }
           break;
@@ -915,18 +917,18 @@ class SqlBaseParser extends Parser {
         _localctx = new ShowColumnsContext(_localctx);
         enterOuterAlt(_localctx, 6);
         {
-        setState(160);
+        setState(162);
         _la = _input.LA(1);
         if ( !(_la==DESC || _la==DESCRIBE) ) {
         _errHandler.recoverInline(this);
         } else {
           consume();
         }
-        setState(163);
+        setState(165);
         switch (_input.LA(1)) {
         case LIKE:
           {
-          setState(161);
+          setState(163);
           ((ShowColumnsContext)_localctx).tableLike = likePattern();
           }
           break;
@@ -975,7 +977,7 @@ class SqlBaseParser extends Parser {
         case QUOTED_IDENTIFIER:
         case BACKQUOTED_IDENTIFIER:
           {
-          setState(162);
+          setState(164);
           ((ShowColumnsContext)_localctx).tableIdent = tableIdentifier();
           }
           break;
@@ -988,15 +990,15 @@ class SqlBaseParser extends Parser {
         _localctx = new ShowFunctionsContext(_localctx);
         enterOuterAlt(_localctx, 7);
         {
-        setState(165);
+        setState(167);
         match(SHOW);
-        setState(166);
-        match(FUNCTIONS);
         setState(168);
+        match(FUNCTIONS);
+        setState(170);
         _la = _input.LA(1);
         if (_la==LIKE) {
           {
-          setState(167);
+          setState(169);
           likePattern();
           }
         }
@@ -1007,9 +1009,9 @@ class SqlBaseParser extends Parser {
         _localctx = new ShowSchemasContext(_localctx);
         enterOuterAlt(_localctx, 8);
         {
-        setState(170);
+        setState(172);
         match(SHOW);
-        setState(171);
+        setState(173);
         match(SCHEMAS);
         }
         break;
@@ -1017,58 +1019,58 @@ class SqlBaseParser extends Parser {
         _localctx = new SysTablesContext(_localctx);
         enterOuterAlt(_localctx, 9);
         {
-        setState(172);
+        setState(174);
         match(SYS);
-        setState(173);
+        setState(175);
         match(TABLES);
-        setState(176);
+        setState(178);
         _la = _input.LA(1);
         if (_la==CATALOG) {
           {
-          setState(174);
+          setState(176);
           match(CATALOG);
-          setState(175);
+          setState(177);
           ((SysTablesContext)_localctx).clusterLike = likePattern();
           }
         }
 
-        setState(180);
+        setState(182);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,11,_ctx) ) {
         case 1:
           {
-          setState(178);
+          setState(180);
           ((SysTablesContext)_localctx).tableLike = likePattern();
           }
           break;
         case 2:
           {
-          setState(179);
+          setState(181);
           ((SysTablesContext)_localctx).tableIdent = tableIdentifier();
           }
           break;
         }
-        setState(191);
+        setState(193);
         _la = _input.LA(1);
         if (_la==TYPE) {
           {
-          setState(182);
+          setState(184);
           match(TYPE);
-          setState(183);
+          setState(185);
           string();
-          setState(188);
+          setState(190);
           _errHandler.sync(this);
           _la = _input.LA(1);
           while (_la==T__2) {
             {
             {
-            setState(184);
+            setState(186);
             match(T__2);
-            setState(185);
+            setState(187);
             string();
             }
             }
-            setState(190);
+            setState(192);
             _errHandler.sync(this);
             _la = _input.LA(1);
           }
@@ -1081,28 +1083,28 @@ class SqlBaseParser extends Parser {
         _localctx = new SysColumnsContext(_localctx);
         enterOuterAlt(_localctx, 10);
         {
-        setState(193);
+        setState(195);
         match(SYS);
-        setState(194);
+        setState(196);
         match(COLUMNS);
-        setState(197);
+        setState(199);
         _la = _input.LA(1);
         if (_la==CATALOG) {
           {
-          setState(195);
+          setState(197);
           match(CATALOG);
-          setState(196);
+          setState(198);
           ((SysColumnsContext)_localctx).cluster = string();
           }
         }
 
-        setState(202);
+        setState(204);
         switch (_input.LA(1)) {
         case TABLE:
           {
-          setState(199);
+          setState(201);
           match(TABLE);
-          setState(200);
+          setState(202);
           ((SysColumnsContext)_localctx).tableLike = likePattern();
           }
           break;
@@ -1151,7 +1153,7 @@ class SqlBaseParser extends Parser {
         case QUOTED_IDENTIFIER:
         case BACKQUOTED_IDENTIFIER:
           {
-          setState(201);
+          setState(203);
           ((SysColumnsContext)_localctx).tableIdent = tableIdentifier();
           }
           break;
@@ -1161,11 +1163,11 @@ class SqlBaseParser extends Parser {
         default:
           throw new NoViableAltException(this);
         }
-        setState(205);
+        setState(207);
         _la = _input.LA(1);
         if (_la==LIKE) {
           {
-          setState(204);
+          setState(206);
           ((SysColumnsContext)_localctx).columnPattern = likePattern();
           }
         }
@@ -1176,19 +1178,19 @@ class SqlBaseParser extends Parser {
         _localctx = new SysTypesContext(_localctx);
         enterOuterAlt(_localctx, 11);
         {
-        setState(207);
+        setState(209);
         match(SYS);
-        setState(208);
+        setState(210);
         match(TYPES);
-        setState(213);
+        setState(215);
         _la = _input.LA(1);
-        if (((((_la - 108)) & ~0x3f) == 0 && ((1L << (_la - 108)) & ((1L << (PLUS - 108)) | (1L << (MINUS - 108)) | (1L << (INTEGER_VALUE - 108)) | (1L << (DECIMAL_VALUE - 108)))) != 0)) {
+        if (((((_la - 113)) & ~0x3f) == 0 && ((1L << (_la - 113)) & ((1L << (PLUS - 113)) | (1L << (MINUS - 113)) | (1L << (INTEGER_VALUE - 113)) | (1L << (DECIMAL_VALUE - 113)))) != 0)) {
           {
-          setState(210);
+          setState(212);
           _la = _input.LA(1);
           if (_la==PLUS || _la==MINUS) {
             {
-            setState(209);
+            setState(211);
             _la = _input.LA(1);
             if ( !(_la==PLUS || _la==MINUS) ) {
             _errHandler.recoverInline(this);
@@ -1198,7 +1200,7 @@ class SqlBaseParser extends Parser {
             }
           }
 
-          setState(212);
+          setState(214);
           ((SysTypesContext)_localctx).type = number();
           }
         }
@@ -1255,34 +1257,34 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(226);
+      setState(228);
       _la = _input.LA(1);
       if (_la==WITH) {
         {
-        setState(217);
+        setState(219);
         match(WITH);
-        setState(218);
+        setState(220);
         namedQuery();
-        setState(223);
+        setState(225);
         _errHandler.sync(this);
         _la = _input.LA(1);
         while (_la==T__2) {
           {
           {
-          setState(219);
+          setState(221);
           match(T__2);
-          setState(220);
+          setState(222);
           namedQuery();
           }
           }
-          setState(225);
+          setState(227);
           _errHandler.sync(this);
           _la = _input.LA(1);
         }
         }
       }
 
-      setState(228);
+      setState(230);
       queryNoWith();
       }
     }
@@ -1338,42 +1340,42 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(230);
+      setState(232);
       queryTerm();
-      setState(241);
+      setState(243);
       _la = _input.LA(1);
       if (_la==ORDER) {
         {
-        setState(231);
-        match(ORDER);
-        setState(232);
-        match(BY);
         setState(233);
+        match(ORDER);
+        setState(234);
+        match(BY);
+        setState(235);
         orderBy();
-        setState(238);
+        setState(240);
         _errHandler.sync(this);
         _la = _input.LA(1);
         while (_la==T__2) {
           {
           {
-          setState(234);
+          setState(236);
           match(T__2);
-          setState(235);
+          setState(237);
           orderBy();
           }
           }
-          setState(240);
+          setState(242);
           _errHandler.sync(this);
           _la = _input.LA(1);
         }
         }
       }
 
-      setState(244);
+      setState(246);
       _la = _input.LA(1);
       if (_la==LIMIT || _la==LIMIT_ESC) {
         {
-        setState(243);
+        setState(245);
         limitClause();
         }
       }
@@ -1422,14 +1424,14 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 10, RULE_limitClause);
     int _la;
     try {
-      setState(251);
+      setState(253);
       switch (_input.LA(1)) {
       case LIMIT:
         enterOuterAlt(_localctx, 1);
         {
-        setState(246);
+        setState(248);
         match(LIMIT);
-        setState(247);
+        setState(249);
         ((LimitClauseContext)_localctx).limit = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==ALL || _la==INTEGER_VALUE) ) {
@@ -1442,9 +1444,9 @@ class SqlBaseParser extends Parser {
       case LIMIT_ESC:
         enterOuterAlt(_localctx, 2);
         {
-        setState(248);
+        setState(250);
         match(LIMIT_ESC);
-        setState(249);
+        setState(251);
         ((LimitClauseContext)_localctx).limit = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==ALL || _la==INTEGER_VALUE) ) {
@@ -1452,7 +1454,7 @@ class SqlBaseParser extends Parser {
         } else {
           consume();
         }
-        setState(250);
+        setState(252);
         match(ESC_END);
         }
         break;
@@ -1525,13 +1527,13 @@ class SqlBaseParser extends Parser {
     QueryTermContext _localctx = new QueryTermContext(_ctx, getState());
     enterRule(_localctx, 12, RULE_queryTerm);
     try {
-      setState(258);
+      setState(260);
       switch (_input.LA(1)) {
       case SELECT:
         _localctx = new QueryPrimaryDefaultContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(253);
+        setState(255);
         querySpecification();
         }
         break;
@@ -1539,11 +1541,11 @@ class SqlBaseParser extends Parser {
         _localctx = new SubqueryContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(254);
-        match(T__0);
-        setState(255);
-        queryNoWith();
         setState(256);
+        match(T__0);
+        setState(257);
+        queryNoWith();
+        setState(258);
         match(T__1);
         }
         break;
@@ -1599,13 +1601,13 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(260);
-      expression();
       setState(262);
+      expression();
+      setState(264);
       _la = _input.LA(1);
       if (_la==ASC || _la==DESC) {
         {
-        setState(261);
+        setState(263);
         ((OrderByContext)_localctx).ordering = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==ASC || _la==DESC) ) {
@@ -1616,13 +1618,13 @@ class SqlBaseParser extends Parser {
         }
       }
 
-      setState(266);
+      setState(268);
       _la = _input.LA(1);
       if (_la==NULLS) {
         {
-        setState(264);
+        setState(266);
         match(NULLS);
-        setState(265);
+        setState(267);
         ((OrderByContext)_localctx).nullOrdering = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==FIRST || _la==LAST) ) {
@@ -1701,75 +1703,75 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(268);
-      match(SELECT);
       setState(270);
+      match(SELECT);
+      setState(272);
       _la = _input.LA(1);
       if (_la==ALL || _la==DISTINCT) {
         {
-        setState(269);
+        setState(271);
         setQuantifier();
         }
       }
 
-      setState(272);
+      setState(274);
       selectItem();
-      setState(277);
+      setState(279);
       _errHandler.sync(this);
       _la = _input.LA(1);
       while (_la==T__2) {
         {
         {
-        setState(273);
+        setState(275);
         match(T__2);
-        setState(274);
+        setState(276);
         selectItem();
         }
         }
-        setState(279);
+        setState(281);
         _errHandler.sync(this);
         _la = _input.LA(1);
       }
-      setState(281);
+      setState(283);
       _la = _input.LA(1);
       if (_la==FROM) {
         {
-        setState(280);
+        setState(282);
         fromClause();
         }
       }
 
-      setState(285);
+      setState(287);
       _la = _input.LA(1);
       if (_la==WHERE) {
         {
-        setState(283);
+        setState(285);
         match(WHERE);
-        setState(284);
+        setState(286);
         ((QuerySpecificationContext)_localctx).where = booleanExpression(0);
         }
       }
 
-      setState(290);
+      setState(292);
       _la = _input.LA(1);
       if (_la==GROUP) {
         {
-        setState(287);
-        match(GROUP);
-        setState(288);
-        match(BY);
         setState(289);
+        match(GROUP);
+        setState(290);
+        match(BY);
+        setState(291);
         groupBy();
         }
       }
 
-      setState(294);
+      setState(296);
       _la = _input.LA(1);
       if (_la==HAVING) {
         {
-        setState(292);
+        setState(294);
         match(HAVING);
-        setState(293);
+        setState(295);
         ((QuerySpecificationContext)_localctx).having = booleanExpression(0);
         }
       }
@@ -1821,23 +1823,23 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(296);
+      setState(298);
       match(FROM);
-      setState(297);
+      setState(299);
       relation();
-      setState(302);
+      setState(304);
       _errHandler.sync(this);
       _la = _input.LA(1);
       while (_la==T__2) {
         {
         {
-        setState(298);
+        setState(300);
         match(T__2);
-        setState(299);
+        setState(301);
         relation();
         }
         }
-        setState(304);
+        setState(306);
         _errHandler.sync(this);
         _la = _input.LA(1);
       }
@@ -1890,30 +1892,30 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(306);
+      setState(308);
       _la = _input.LA(1);
       if (_la==ALL || _la==DISTINCT) {
         {
-        setState(305);
+        setState(307);
         setQuantifier();
         }
       }
 
-      setState(308);
+      setState(310);
       groupingElement();
-      setState(313);
+      setState(315);
       _errHandler.sync(this);
       _la = _input.LA(1);
       while (_la==T__2) {
         {
         {
-        setState(309);
+        setState(311);
         match(T__2);
-        setState(310);
+        setState(312);
         groupingElement();
         }
         }
-        setState(315);
+        setState(317);
         _errHandler.sync(this);
         _la = _input.LA(1);
       }
@@ -1968,7 +1970,7 @@ class SqlBaseParser extends Parser {
       _localctx = new SingleGroupingSetContext(_localctx);
       enterOuterAlt(_localctx, 1);
       {
-      setState(316);
+      setState(318);
       groupingExpressions();
       }
     }
@@ -2014,47 +2016,47 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 24, RULE_groupingExpressions);
     int _la;
     try {
-      setState(331);
+      setState(333);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,40,_ctx) ) {
       case 1:
         enterOuterAlt(_localctx, 1);
         {
-        setState(318);
+        setState(320);
         match(T__0);
-        setState(327);
+        setState(329);
         _la = _input.LA(1);
-        if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__0) | (1L << ANALYZE) | (1L << ANALYZED) | (1L << CAST) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CONVERT) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXISTS) | (1L << EXPLAIN) | (1L << EXTRACT) | (1L << FALSE) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LEFT) | (1L << LIMIT) | (1L << MAPPED) | (1L << MATCH) | (1L << MINUTE) | (1L << MONTH) | (1L << NOT) | (1L << NULL))) != 0) || ((((_la - 64)) & ~0x3f) == 0 && ((1L << (_la - 64)) & ((1L << (OPTIMIZED - 64)) | (1L << (PARSED - 64)) | (1L << (PHYSICAL - 64)) | (1L << (PLAN - 64)) | (1L << (RIGHT - 64)) | (1L << (RLIKE - 64)) | (1L << (QUERY - 64)) | (1L << (SCHEMAS - 64)) | (1L << (SECOND - 64)) | (1L << (SHOW - 64)) | (1L << (SYS - 64)) | (1L << (TABLES - 64)) | (1L << (TEXT - 64)) | (1L << (TRUE - 64)) | (1L << (TYPE - 64)) | (1L << (TYPES - 64)) | (1L << (VERIFY - 64)) | (1L << (YEAR - 64)) | (1L << (FUNCTION_ESC - 64)) | (1L << (DATE_ESC - 64)) | (1L << (TIME_ESC - 64)) | (1L << (TIMESTAMP_ESC - 64)) | (1L << (GUID_ESC - 64)) | (1L << (PLUS - 64)) | (1L << (MINUS - 64)) | (1L << (ASTERISK - 64)) | (1L << (PARAM - 64)) | (1L << (STRING - 64)) | (1L << (INTEGER_VALUE - 64)) | (1L << (DECIMAL_VALUE - 64)) | (1L << (IDENTIFIER - 64)) | (1L << (DIGIT_IDENTIFIER - 64)) | (1L << (QUOTED_IDENTIFIER - 64)) | (1L << (BACKQUOTED_IDENTIFIER - 64)))) != 0)) {
+        if (((((_la - 1)) & ~0x3f) == 0 && ((1L << (_la - 1)) & ((1L << (T__0 - 1)) | (1L << (ANALYZE - 1)) | (1L << (ANALYZED - 1)) | (1L << (CASE - 1)) | (1L << (CAST - 1)) | (1L << (CATALOGS - 1)) | (1L << (COLUMNS - 1)) | (1L << (CONVERT - 1)) | (1L << (CURRENT_DATE - 1)) | (1L << (CURRENT_TIME - 1)) | (1L << (CURRENT_TIMESTAMP - 1)) | (1L << (DAY - 1)) | (1L << (DEBUG - 1)) | (1L << (EXECUTABLE - 1)) | (1L << (EXISTS - 1)) | (1L << (EXPLAIN - 1)) | (1L << (EXTRACT - 1)) | (1L << (FALSE - 1)) | (1L << (FIRST - 1)) | (1L << (FORMAT - 1)) | (1L << (FULL - 1)) | (1L << (FUNCTIONS - 1)) | (1L << (GRAPHVIZ - 1)) | (1L << (HOUR - 1)) | (1L << (INTERVAL - 1)) | (1L << (LAST - 1)) | (1L << (LEFT - 1)) | (1L << (LIMIT - 1)) | (1L << (MAPPED - 1)) | (1L << (MATCH - 1)) | (1L << (MINUTE - 1)) | (1L << (MONTH - 1)) | (1L << (NOT - 1)) | (1L << (NULL - 1)))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RIGHT - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TRUE - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)) | (1L << (FUNCTION_ESC - 67)) | (1L << (DATE_ESC - 67)) | (1L << (TIME_ESC - 67)) | (1L << (TIMESTAMP_ESC - 67)) | (1L << (GUID_ESC - 67)) | (1L << (PLUS - 67)) | (1L << (MINUS - 67)) | (1L << (ASTERISK - 67)) | (1L << (PARAM - 67)) | (1L << (STRING - 67)) | (1L << (INTEGER_VALUE - 67)) | (1L << (DECIMAL_VALUE - 67)) | (1L << (IDENTIFIER - 67)) | (1L << (DIGIT_IDENTIFIER - 67)) | (1L << (QUOTED_IDENTIFIER - 67)) | (1L << (BACKQUOTED_IDENTIFIER - 67)))) != 0)) {
           {
-          setState(319);
+          setState(321);
           expression();
-          setState(324);
+          setState(326);
           _errHandler.sync(this);
           _la = _input.LA(1);
           while (_la==T__2) {
             {
             {
-            setState(320);
+            setState(322);
             match(T__2);
-            setState(321);
+            setState(323);
             expression();
             }
             }
-            setState(326);
+            setState(328);
             _errHandler.sync(this);
             _la = _input.LA(1);
           }
           }
         }
 
-        setState(329);
+        setState(331);
         match(T__1);
         }
         break;
       case 2:
         enterOuterAlt(_localctx, 2);
         {
-        setState(330);
+        setState(332);
         expression();
         }
         break;
@@ -2105,15 +2107,15 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(333);
-      ((NamedQueryContext)_localctx).name = identifier();
-      setState(334);
-      match(AS);
       setState(335);
-      match(T__0);
+      ((NamedQueryContext)_localctx).name = identifier();
       setState(336);
-      queryNoWith();
+      match(AS);
       setState(337);
+      match(T__0);
+      setState(338);
+      queryNoWith();
+      setState(339);
       match(T__1);
       }
     }
@@ -2157,7 +2159,7 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(339);
+      setState(341);
       _la = _input.LA(1);
       if ( !(_la==ALL || _la==DISTINCT) ) {
       _errHandler.recoverInline(this);
@@ -2220,23 +2222,23 @@ class SqlBaseParser extends Parser {
       _localctx = new SelectExpressionContext(_localctx);
       enterOuterAlt(_localctx, 1);
       {
-      setState(341);
+      setState(343);
       expression();
-      setState(346);
+      setState(348);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,42,_ctx) ) {
       case 1:
         {
-        setState(343);
+        setState(345);
         _la = _input.LA(1);
         if (_la==AS) {
           {
-          setState(342);
+          setState(344);
           match(AS);
           }
         }
 
-        setState(345);
+        setState(347);
         identifier();
         }
         break;
@@ -2290,19 +2292,19 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(348);
+      setState(350);
       relationPrimary();
-      setState(352);
+      setState(354);
       _errHandler.sync(this);
       _la = _input.LA(1);
-      while (((((_la - 37)) & ~0x3f) == 0 && ((1L << (_la - 37)) & ((1L << (FULL - 37)) | (1L << (INNER - 37)) | (1L << (JOIN - 37)) | (1L << (LEFT - 37)) | (1L << (NATURAL - 37)) | (1L << (RIGHT - 37)))) != 0)) {
+      while (((((_la - 40)) & ~0x3f) == 0 && ((1L << (_la - 40)) & ((1L << (FULL - 40)) | (1L << (INNER - 40)) | (1L << (JOIN - 40)) | (1L << (LEFT - 40)) | (1L << (NATURAL - 40)) | (1L << (RIGHT - 40)))) != 0)) {
         {
         {
-        setState(349);
+        setState(351);
         joinRelation();
         }
         }
-        setState(354);
+        setState(356);
         _errHandler.sync(this);
         _la = _input.LA(1);
       }
@@ -2356,7 +2358,7 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 34, RULE_joinRelation);
     int _la;
     try {
-      setState(366);
+      setState(368);
       switch (_input.LA(1)) {
       case FULL:
       case INNER:
@@ -2366,18 +2368,18 @@ class SqlBaseParser extends Parser {
         enterOuterAlt(_localctx, 1);
         {
         {
-        setState(355);
+        setState(357);
         joinType();
         }
-        setState(356);
+        setState(358);
         match(JOIN);
-        setState(357);
-        ((JoinRelationContext)_localctx).right = relationPrimary();
         setState(359);
+        ((JoinRelationContext)_localctx).right = relationPrimary();
+        setState(361);
         _la = _input.LA(1);
         if (_la==ON || _la==USING) {
           {
-          setState(358);
+          setState(360);
           joinCriteria();
           }
         }
@@ -2387,13 +2389,13 @@ class SqlBaseParser extends Parser {
       case NATURAL:
         enterOuterAlt(_localctx, 2);
         {
-        setState(361);
-        match(NATURAL);
-        setState(362);
-        joinType();
         setState(363);
-        match(JOIN);
+        match(NATURAL);
         setState(364);
+        joinType();
+        setState(365);
+        match(JOIN);
+        setState(366);
         ((JoinRelationContext)_localctx).right = relationPrimary();
         }
         break;
@@ -2442,17 +2444,17 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 36, RULE_joinType);
     int _la;
     try {
-      setState(383);
+      setState(385);
       switch (_input.LA(1)) {
       case INNER:
       case JOIN:
         enterOuterAlt(_localctx, 1);
         {
-        setState(369);
+        setState(371);
         _la = _input.LA(1);
         if (_la==INNER) {
           {
-          setState(368);
+          setState(370);
           match(INNER);
           }
         }
@@ -2462,13 +2464,13 @@ class SqlBaseParser extends Parser {
       case LEFT:
         enterOuterAlt(_localctx, 2);
         {
-        setState(371);
-        match(LEFT);
         setState(373);
+        match(LEFT);
+        setState(375);
         _la = _input.LA(1);
         if (_la==OUTER) {
           {
-          setState(372);
+          setState(374);
           match(OUTER);
           }
         }
@@ -2478,13 +2480,13 @@ class SqlBaseParser extends Parser {
       case RIGHT:
         enterOuterAlt(_localctx, 3);
         {
-        setState(375);
-        match(RIGHT);
         setState(377);
+        match(RIGHT);
+        setState(379);
         _la = _input.LA(1);
         if (_la==OUTER) {
           {
-          setState(376);
+          setState(378);
           match(OUTER);
           }
         }
@@ -2494,13 +2496,13 @@ class SqlBaseParser extends Parser {
       case FULL:
         enterOuterAlt(_localctx, 4);
         {
-        setState(379);
-        match(FULL);
         setState(381);
+        match(FULL);
+        setState(383);
         _la = _input.LA(1);
         if (_la==OUTER) {
           {
-          setState(380);
+          setState(382);
           match(OUTER);
           }
         }
@@ -2558,43 +2560,43 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 38, RULE_joinCriteria);
     int _la;
     try {
-      setState(399);
+      setState(401);
       switch (_input.LA(1)) {
       case ON:
         enterOuterAlt(_localctx, 1);
         {
-        setState(385);
+        setState(387);
         match(ON);
-        setState(386);
+        setState(388);
         booleanExpression(0);
         }
         break;
       case USING:
         enterOuterAlt(_localctx, 2);
         {
-        setState(387);
-        match(USING);
-        setState(388);
-        match(T__0);
         setState(389);
+        match(USING);
+        setState(390);
+        match(T__0);
+        setState(391);
         identifier();
-        setState(394);
+        setState(396);
         _errHandler.sync(this);
         _la = _input.LA(1);
         while (_la==T__2) {
           {
           {
-          setState(390);
+          setState(392);
           match(T__2);
-          setState(391);
+          setState(393);
           identifier();
           }
           }
-          setState(396);
+          setState(398);
           _errHandler.sync(this);
           _la = _input.LA(1);
         }
-        setState(397);
+        setState(399);
         match(T__1);
         }
         break;
@@ -2699,30 +2701,30 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 40, RULE_relationPrimary);
     int _la;
     try {
-      setState(426);
+      setState(428);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,59,_ctx) ) {
       case 1:
         _localctx = new TableNameContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(401);
+        setState(403);
         tableIdentifier();
-        setState(406);
+        setState(408);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,54,_ctx) ) {
         case 1:
           {
-          setState(403);
+          setState(405);
           _la = _input.LA(1);
           if (_la==AS) {
             {
-            setState(402);
+            setState(404);
             match(AS);
             }
           }
 
-          setState(405);
+          setState(407);
           qualifiedName();
           }
           break;
@@ -2733,27 +2735,27 @@ class SqlBaseParser extends Parser {
         _localctx = new AliasedQueryContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(408);
-        match(T__0);
-        setState(409);
-        queryNoWith();
         setState(410);
+        match(T__0);
+        setState(411);
+        queryNoWith();
+        setState(412);
         match(T__1);
-        setState(415);
+        setState(417);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,56,_ctx) ) {
         case 1:
           {
-          setState(412);
+          setState(414);
           _la = _input.LA(1);
           if (_la==AS) {
             {
-            setState(411);
+            setState(413);
             match(AS);
             }
           }
 
-          setState(414);
+          setState(416);
           qualifiedName();
           }
           break;
@@ -2764,27 +2766,27 @@ class SqlBaseParser extends Parser {
         _localctx = new AliasedRelationContext(_localctx);
         enterOuterAlt(_localctx, 3);
         {
-        setState(417);
-        match(T__0);
-        setState(418);
-        relation();
         setState(419);
+        match(T__0);
+        setState(420);
+        relation();
+        setState(421);
         match(T__1);
-        setState(424);
+        setState(426);
         _errHandler.sync(this);
         switch ( getInterpreter().adaptivePredict(_input,58,_ctx) ) {
         case 1:
           {
-          setState(421);
+          setState(423);
           _la = _input.LA(1);
           if (_la==AS) {
             {
-            setState(420);
+            setState(422);
             match(AS);
             }
           }
 
-          setState(423);
+          setState(425);
           qualifiedName();
           }
           break;
@@ -2833,7 +2835,7 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(428);
+      setState(430);
       booleanExpression(0);
       }
     }
@@ -3041,7 +3043,7 @@ class SqlBaseParser extends Parser {
       int _alt;
       enterOuterAlt(_localctx, 1);
       {
-      setState(461);
+      setState(463);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,60,_ctx) ) {
       case 1:
@@ -3050,9 +3052,9 @@ class SqlBaseParser extends Parser {
         _ctx = _localctx;
         _prevctx = _localctx;
 
-        setState(431);
+        setState(433);
         match(NOT);
-        setState(432);
+        setState(434);
         booleanExpression(8);
         }
         break;
@@ -3061,13 +3063,13 @@ class SqlBaseParser extends Parser {
         _localctx = new ExistsContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(433);
-        match(EXISTS);
-        setState(434);
-        match(T__0);
         setState(435);
-        query();
+        match(EXISTS);
         setState(436);
+        match(T__0);
+        setState(437);
+        query();
+        setState(438);
         match(T__1);
         }
         break;
@@ -3076,15 +3078,15 @@ class SqlBaseParser extends Parser {
         _localctx = new StringQueryContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(438);
-        match(QUERY);
-        setState(439);
-        match(T__0);
         setState(440);
-        ((StringQueryContext)_localctx).queryString = string();
+        match(QUERY);
         setState(441);
-        matchQueryOptions();
+        match(T__0);
         setState(442);
+        ((StringQueryContext)_localctx).queryString = string();
+        setState(443);
+        matchQueryOptions();
+        setState(444);
         match(T__1);
         }
         break;
@@ -3093,19 +3095,19 @@ class SqlBaseParser extends Parser {
         _localctx = new MatchQueryContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(444);
-        match(MATCH);
-        setState(445);
-        match(T__0);
         setState(446);
-        ((MatchQueryContext)_localctx).singleField = qualifiedName();
+        match(MATCH);
         setState(447);
-        match(T__2);
+        match(T__0);
         setState(448);
-        ((MatchQueryContext)_localctx).queryString = string();
+        ((MatchQueryContext)_localctx).singleField = qualifiedName();
         setState(449);
-        matchQueryOptions();
+        match(T__2);
         setState(450);
+        ((MatchQueryContext)_localctx).queryString = string();
+        setState(451);
+        matchQueryOptions();
+        setState(452);
         match(T__1);
         }
         break;
@@ -3114,19 +3116,19 @@ class SqlBaseParser extends Parser {
         _localctx = new MultiMatchQueryContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(452);
-        match(MATCH);
-        setState(453);
-        match(T__0);
         setState(454);
-        ((MultiMatchQueryContext)_localctx).multiFields = string();
+        match(MATCH);
         setState(455);
-        match(T__2);
+        match(T__0);
         setState(456);
-        ((MultiMatchQueryContext)_localctx).queryString = string();
+        ((MultiMatchQueryContext)_localctx).multiFields = string();
         setState(457);
-        matchQueryOptions();
+        match(T__2);
         setState(458);
+        ((MultiMatchQueryContext)_localctx).queryString = string();
+        setState(459);
+        matchQueryOptions();
+        setState(460);
         match(T__1);
         }
         break;
@@ -3135,13 +3137,13 @@ class SqlBaseParser extends Parser {
         _localctx = new BooleanDefaultContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(460);
+        setState(462);
         predicated();
         }
         break;
       }
       _ctx.stop = _input.LT(-1);
-      setState(471);
+      setState(473);
       _errHandler.sync(this);
       _alt = getInterpreter().adaptivePredict(_input,62,_ctx);
       while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
@@ -3149,7 +3151,7 @@ class SqlBaseParser extends Parser {
           if ( _parseListeners!=null ) triggerExitRuleEvent();
           _prevctx = _localctx;
           {
-          setState(469);
+          setState(471);
           _errHandler.sync(this);
           switch ( getInterpreter().adaptivePredict(_input,61,_ctx) ) {
           case 1:
@@ -3157,11 +3159,11 @@ class SqlBaseParser extends Parser {
             _localctx = new LogicalBinaryContext(new BooleanExpressionContext(_parentctx, _parentState));
             ((LogicalBinaryContext)_localctx).left = _prevctx;
             pushNewRecursionContext(_localctx, _startState, RULE_booleanExpression);
-            setState(463);
-            if (!(precpred(_ctx, 2))) throw new FailedPredicateException(this, "precpred(_ctx, 2)");
-            setState(464);
-            ((LogicalBinaryContext)_localctx).operator = match(AND);
             setState(465);
+            if (!(precpred(_ctx, 2))) throw new FailedPredicateException(this, "precpred(_ctx, 2)");
+            setState(466);
+            ((LogicalBinaryContext)_localctx).operator = match(AND);
+            setState(467);
             ((LogicalBinaryContext)_localctx).right = booleanExpression(3);
             }
             break;
@@ -3170,18 +3172,18 @@ class SqlBaseParser extends Parser {
             _localctx = new LogicalBinaryContext(new BooleanExpressionContext(_parentctx, _parentState));
             ((LogicalBinaryContext)_localctx).left = _prevctx;
             pushNewRecursionContext(_localctx, _startState, RULE_booleanExpression);
-            setState(466);
-            if (!(precpred(_ctx, 1))) throw new FailedPredicateException(this, "precpred(_ctx, 1)");
-            setState(467);
-            ((LogicalBinaryContext)_localctx).operator = match(OR);
             setState(468);
+            if (!(precpred(_ctx, 1))) throw new FailedPredicateException(this, "precpred(_ctx, 1)");
+            setState(469);
+            ((LogicalBinaryContext)_localctx).operator = match(OR);
+            setState(470);
             ((LogicalBinaryContext)_localctx).right = booleanExpression(2);
             }
             break;
           }
           } 
         }
-        setState(473);
+        setState(475);
         _errHandler.sync(this);
         _alt = getInterpreter().adaptivePredict(_input,62,_ctx);
       }
@@ -3231,19 +3233,19 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(478);
+      setState(480);
       _errHandler.sync(this);
       _la = _input.LA(1);
       while (_la==T__2) {
         {
         {
-        setState(474);
+        setState(476);
         match(T__2);
-        setState(475);
+        setState(477);
         string();
         }
         }
-        setState(480);
+        setState(482);
         _errHandler.sync(this);
         _la = _input.LA(1);
       }
@@ -3292,14 +3294,14 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(481);
-      valueExpression(0);
       setState(483);
+      valueExpression(0);
+      setState(485);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,64,_ctx) ) {
       case 1:
         {
-        setState(482);
+        setState(484);
         predicate();
         }
         break;
@@ -3369,142 +3371,142 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 50, RULE_predicate);
     int _la;
     try {
-      setState(531);
+      setState(533);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,72,_ctx) ) {
       case 1:
         enterOuterAlt(_localctx, 1);
         {
-        setState(486);
+        setState(488);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(485);
+          setState(487);
           match(NOT);
           }
         }
 
-        setState(488);
-        ((PredicateContext)_localctx).kind = match(BETWEEN);
-        setState(489);
-        ((PredicateContext)_localctx).lower = valueExpression(0);
         setState(490);
-        match(AND);
+        ((PredicateContext)_localctx).kind = match(BETWEEN);
         setState(491);
+        ((PredicateContext)_localctx).lower = valueExpression(0);
+        setState(492);
+        match(AND);
+        setState(493);
         ((PredicateContext)_localctx).upper = valueExpression(0);
         }
         break;
       case 2:
         enterOuterAlt(_localctx, 2);
         {
-        setState(494);
+        setState(496);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(493);
+          setState(495);
           match(NOT);
           }
         }
 
-        setState(496);
-        ((PredicateContext)_localctx).kind = match(IN);
-        setState(497);
-        match(T__0);
         setState(498);
+        ((PredicateContext)_localctx).kind = match(IN);
+        setState(499);
+        match(T__0);
+        setState(500);
         valueExpression(0);
-        setState(503);
+        setState(505);
         _errHandler.sync(this);
         _la = _input.LA(1);
         while (_la==T__2) {
           {
           {
-          setState(499);
+          setState(501);
           match(T__2);
-          setState(500);
+          setState(502);
           valueExpression(0);
           }
           }
-          setState(505);
+          setState(507);
           _errHandler.sync(this);
           _la = _input.LA(1);
         }
-        setState(506);
+        setState(508);
         match(T__1);
         }
         break;
       case 3:
         enterOuterAlt(_localctx, 3);
         {
-        setState(509);
+        setState(511);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(508);
+          setState(510);
           match(NOT);
           }
         }
 
-        setState(511);
-        ((PredicateContext)_localctx).kind = match(IN);
-        setState(512);
-        match(T__0);
         setState(513);
-        query();
+        ((PredicateContext)_localctx).kind = match(IN);
         setState(514);
+        match(T__0);
+        setState(515);
+        query();
+        setState(516);
         match(T__1);
         }
         break;
       case 4:
         enterOuterAlt(_localctx, 4);
         {
-        setState(517);
+        setState(519);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(516);
+          setState(518);
           match(NOT);
           }
         }
 
-        setState(519);
+        setState(521);
         ((PredicateContext)_localctx).kind = match(LIKE);
-        setState(520);
+        setState(522);
         pattern();
         }
         break;
       case 5:
         enterOuterAlt(_localctx, 5);
         {
-        setState(522);
+        setState(524);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(521);
+          setState(523);
           match(NOT);
           }
         }
 
-        setState(524);
+        setState(526);
         ((PredicateContext)_localctx).kind = match(RLIKE);
-        setState(525);
+        setState(527);
         ((PredicateContext)_localctx).regex = string();
         }
         break;
       case 6:
         enterOuterAlt(_localctx, 6);
         {
-        setState(526);
-        match(IS);
         setState(528);
+        match(IS);
+        setState(530);
         _la = _input.LA(1);
         if (_la==NOT) {
           {
-          setState(527);
+          setState(529);
           match(NOT);
           }
         }
 
-        setState(530);
+        setState(532);
         ((PredicateContext)_localctx).kind = match(NULL);
         }
         break;
@@ -3551,9 +3553,9 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(533);
+      setState(535);
       match(LIKE);
-      setState(534);
+      setState(536);
       pattern();
       }
     }
@@ -3601,14 +3603,14 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(536);
-      ((PatternContext)_localctx).value = string();
       setState(538);
+      ((PatternContext)_localctx).value = string();
+      setState(540);
       _errHandler.sync(this);
       switch ( getInterpreter().adaptivePredict(_input,73,_ctx) ) {
       case 1:
         {
-        setState(537);
+        setState(539);
         patternEscape();
         }
         break;
@@ -3656,25 +3658,25 @@ class SqlBaseParser extends Parser {
     PatternEscapeContext _localctx = new PatternEscapeContext(_ctx, getState());
     enterRule(_localctx, 56, RULE_patternEscape);
     try {
-      setState(546);
+      setState(548);
       switch (_input.LA(1)) {
       case ESCAPE:
         enterOuterAlt(_localctx, 1);
         {
-        setState(540);
+        setState(542);
         match(ESCAPE);
-        setState(541);
+        setState(543);
         ((PatternEscapeContext)_localctx).escape = string();
         }
         break;
       case ESCAPE_ESC:
         enterOuterAlt(_localctx, 2);
         {
-        setState(542);
-        match(ESCAPE_ESC);
-        setState(543);
-        ((PatternEscapeContext)_localctx).escape = string();
         setState(544);
+        match(ESCAPE_ESC);
+        setState(545);
+        ((PatternEscapeContext)_localctx).escape = string();
+        setState(546);
         match(ESC_END);
         }
         break;
@@ -3819,11 +3821,12 @@ class SqlBaseParser extends Parser {
       int _alt;
       enterOuterAlt(_localctx, 1);
       {
-      setState(552);
+      setState(554);
       switch (_input.LA(1)) {
       case T__0:
       case ANALYZE:
       case ANALYZED:
+      case CASE:
       case CAST:
       case CATALOGS:
       case COLUMNS:
@@ -3888,7 +3891,7 @@ class SqlBaseParser extends Parser {
         _ctx = _localctx;
         _prevctx = _localctx;
 
-        setState(549);
+        setState(551);
         primaryExpression(0);
         }
         break;
@@ -3898,7 +3901,7 @@ class SqlBaseParser extends Parser {
         _localctx = new ArithmeticUnaryContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(550);
+        setState(552);
         ((ArithmeticUnaryContext)_localctx).operator = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==PLUS || _la==MINUS) ) {
@@ -3906,7 +3909,7 @@ class SqlBaseParser extends Parser {
         } else {
           consume();
         }
-        setState(551);
+        setState(553);
         valueExpression(4);
         }
         break;
@@ -3914,7 +3917,7 @@ class SqlBaseParser extends Parser {
         throw new NoViableAltException(this);
       }
       _ctx.stop = _input.LT(-1);
-      setState(566);
+      setState(568);
       _errHandler.sync(this);
       _alt = getInterpreter().adaptivePredict(_input,77,_ctx);
       while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
@@ -3922,7 +3925,7 @@ class SqlBaseParser extends Parser {
           if ( _parseListeners!=null ) triggerExitRuleEvent();
           _prevctx = _localctx;
           {
-          setState(564);
+          setState(566);
           _errHandler.sync(this);
           switch ( getInterpreter().adaptivePredict(_input,76,_ctx) ) {
           case 1:
@@ -3930,17 +3933,17 @@ class SqlBaseParser extends Parser {
             _localctx = new ArithmeticBinaryContext(new ValueExpressionContext(_parentctx, _parentState));
             ((ArithmeticBinaryContext)_localctx).left = _prevctx;
             pushNewRecursionContext(_localctx, _startState, RULE_valueExpression);
-            setState(554);
+            setState(556);
             if (!(precpred(_ctx, 3))) throw new FailedPredicateException(this, "precpred(_ctx, 3)");
-            setState(555);
+            setState(557);
             ((ArithmeticBinaryContext)_localctx).operator = _input.LT(1);
             _la = _input.LA(1);
-            if ( !(((((_la - 110)) & ~0x3f) == 0 && ((1L << (_la - 110)) & ((1L << (ASTERISK - 110)) | (1L << (SLASH - 110)) | (1L << (PERCENT - 110)))) != 0)) ) {
+            if ( !(((((_la - 115)) & ~0x3f) == 0 && ((1L << (_la - 115)) & ((1L << (ASTERISK - 115)) | (1L << (SLASH - 115)) | (1L << (PERCENT - 115)))) != 0)) ) {
               ((ArithmeticBinaryContext)_localctx).operator = (Token)_errHandler.recoverInline(this);
             } else {
               consume();
             }
-            setState(556);
+            setState(558);
             ((ArithmeticBinaryContext)_localctx).right = valueExpression(4);
             }
             break;
@@ -3949,9 +3952,9 @@ class SqlBaseParser extends Parser {
             _localctx = new ArithmeticBinaryContext(new ValueExpressionContext(_parentctx, _parentState));
             ((ArithmeticBinaryContext)_localctx).left = _prevctx;
             pushNewRecursionContext(_localctx, _startState, RULE_valueExpression);
-            setState(557);
+            setState(559);
             if (!(precpred(_ctx, 2))) throw new FailedPredicateException(this, "precpred(_ctx, 2)");
-            setState(558);
+            setState(560);
             ((ArithmeticBinaryContext)_localctx).operator = _input.LT(1);
             _la = _input.LA(1);
             if ( !(_la==PLUS || _la==MINUS) ) {
@@ -3959,7 +3962,7 @@ class SqlBaseParser extends Parser {
             } else {
               consume();
             }
-            setState(559);
+            setState(561);
             ((ArithmeticBinaryContext)_localctx).right = valueExpression(3);
             }
             break;
@@ -3968,18 +3971,18 @@ class SqlBaseParser extends Parser {
             _localctx = new ComparisonContext(new ValueExpressionContext(_parentctx, _parentState));
             ((ComparisonContext)_localctx).left = _prevctx;
             pushNewRecursionContext(_localctx, _startState, RULE_valueExpression);
-            setState(560);
-            if (!(precpred(_ctx, 1))) throw new FailedPredicateException(this, "precpred(_ctx, 1)");
-            setState(561);
-            comparisonOperator();
             setState(562);
+            if (!(precpred(_ctx, 1))) throw new FailedPredicateException(this, "precpred(_ctx, 1)");
+            setState(563);
+            comparisonOperator();
+            setState(564);
             ((ComparisonContext)_localctx).right = valueExpression(2);
             }
             break;
           }
           } 
         }
-        setState(568);
+        setState(570);
         _errHandler.sync(this);
         _alt = getInterpreter().adaptivePredict(_input,77,_ctx);
       }
@@ -4203,6 +4206,39 @@ class SqlBaseParser extends Parser {
       else return visitor.visitChildren(this);
     }
   }
+  public static class CaseContext extends PrimaryExpressionContext {
+    public BooleanExpressionContext operand;
+    public BooleanExpressionContext elseClause;
+    public TerminalNode CASE() { return getToken(SqlBaseParser.CASE, 0); }
+    public TerminalNode END() { return getToken(SqlBaseParser.END, 0); }
+    public List<WhenClauseContext> whenClause() {
+      return getRuleContexts(WhenClauseContext.class);
+    }
+    public WhenClauseContext whenClause(int i) {
+      return getRuleContext(WhenClauseContext.class,i);
+    }
+    public TerminalNode ELSE() { return getToken(SqlBaseParser.ELSE, 0); }
+    public List<BooleanExpressionContext> booleanExpression() {
+      return getRuleContexts(BooleanExpressionContext.class);
+    }
+    public BooleanExpressionContext booleanExpression(int i) {
+      return getRuleContext(BooleanExpressionContext.class,i);
+    }
+    public CaseContext(PrimaryExpressionContext ctx) { copyFrom(ctx); }
+    @Override
+    public void enterRule(ParseTreeListener listener) {
+      if ( listener instanceof SqlBaseListener ) ((SqlBaseListener)listener).enterCase(this);
+    }
+    @Override
+    public void exitRule(ParseTreeListener listener) {
+      if ( listener instanceof SqlBaseListener ) ((SqlBaseListener)listener).exitCase(this);
+    }
+    @Override
+    public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+      if ( visitor instanceof SqlBaseVisitor ) return ((SqlBaseVisitor<? extends T>)visitor).visitCase(this);
+      else return visitor.visitChildren(this);
+    }
+  }
 
   public final PrimaryExpressionContext primaryExpression() throws RecognitionException {
     return primaryExpression(0);
@@ -4220,16 +4256,16 @@ class SqlBaseParser extends Parser {
       int _alt;
       enterOuterAlt(_localctx, 1);
       {
-      setState(590);
+      setState(607);
       _errHandler.sync(this);
-      switch ( getInterpreter().adaptivePredict(_input,79,_ctx) ) {
+      switch ( getInterpreter().adaptivePredict(_input,82,_ctx) ) {
       case 1:
         {
         _localctx = new CastContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
 
-        setState(570);
+        setState(572);
         castExpression();
         }
         break;
@@ -4238,7 +4274,7 @@ class SqlBaseParser extends Parser {
         _localctx = new ExtractContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(571);
+        setState(573);
         extractExpression();
         }
         break;
@@ -4247,7 +4283,7 @@ class SqlBaseParser extends Parser {
         _localctx = new CurrentDateTimeFunctionContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(572);
+        setState(574);
         builtinDateTimeFunction();
         }
         break;
@@ -4256,7 +4292,7 @@ class SqlBaseParser extends Parser {
         _localctx = new ConstantDefaultContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(573);
+        setState(575);
         constant();
         }
         break;
@@ -4265,18 +4301,18 @@ class SqlBaseParser extends Parser {
         _localctx = new StarContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(577);
+        setState(579);
         _la = _input.LA(1);
-        if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 64)) & ~0x3f) == 0 && ((1L << (_la - 64)) & ((1L << (OPTIMIZED - 64)) | (1L << (PARSED - 64)) | (1L << (PHYSICAL - 64)) | (1L << (PLAN - 64)) | (1L << (RLIKE - 64)) | (1L << (QUERY - 64)) | (1L << (SCHEMAS - 64)) | (1L << (SECOND - 64)) | (1L << (SHOW - 64)) | (1L << (SYS - 64)) | (1L << (TABLES - 64)) | (1L << (TEXT - 64)) | (1L << (TYPE - 64)) | (1L << (TYPES - 64)) | (1L << (VERIFY - 64)) | (1L << (YEAR - 64)) | (1L << (IDENTIFIER - 64)) | (1L << (DIGIT_IDENTIFIER - 64)) | (1L << (QUOTED_IDENTIFIER - 64)) | (1L << (BACKQUOTED_IDENTIFIER - 64)))) != 0)) {
+        if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)) | (1L << (IDENTIFIER - 67)) | (1L << (DIGIT_IDENTIFIER - 67)) | (1L << (QUOTED_IDENTIFIER - 67)) | (1L << (BACKQUOTED_IDENTIFIER - 67)))) != 0)) {
           {
-          setState(574);
+          setState(576);
           qualifiedName();
-          setState(575);
+          setState(577);
           match(DOT);
           }
         }
 
-        setState(579);
+        setState(581);
         match(ASTERISK);
         }
         break;
@@ -4285,7 +4321,7 @@ class SqlBaseParser extends Parser {
         _localctx = new FunctionContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(580);
+        setState(582);
         functionExpression();
         }
         break;
@@ -4294,11 +4330,11 @@ class SqlBaseParser extends Parser {
         _localctx = new SubqueryExpressionContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(581);
-        match(T__0);
-        setState(582);
-        query();
         setState(583);
+        match(T__0);
+        setState(584);
+        query();
+        setState(585);
         match(T__1);
         }
         break;
@@ -4307,7 +4343,7 @@ class SqlBaseParser extends Parser {
         _localctx = new DereferenceContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(585);
+        setState(587);
         qualifiedName();
         }
         break;
@@ -4316,19 +4352,64 @@ class SqlBaseParser extends Parser {
         _localctx = new ParenthesizedExpressionContext(_localctx);
         _ctx = _localctx;
         _prevctx = _localctx;
-        setState(586);
-        match(T__0);
-        setState(587);
-        expression();
         setState(588);
+        match(T__0);
+        setState(589);
+        expression();
+        setState(590);
         match(T__1);
         }
         break;
+      case 10:
+        {
+        _localctx = new CaseContext(_localctx);
+        _ctx = _localctx;
+        _prevctx = _localctx;
+        setState(592);
+        match(CASE);
+        setState(594);
+        _la = _input.LA(1);
+        if (((((_la - 1)) & ~0x3f) == 0 && ((1L << (_la - 1)) & ((1L << (T__0 - 1)) | (1L << (ANALYZE - 1)) | (1L << (ANALYZED - 1)) | (1L << (CASE - 1)) | (1L << (CAST - 1)) | (1L << (CATALOGS - 1)) | (1L << (COLUMNS - 1)) | (1L << (CONVERT - 1)) | (1L << (CURRENT_DATE - 1)) | (1L << (CURRENT_TIME - 1)) | (1L << (CURRENT_TIMESTAMP - 1)) | (1L << (DAY - 1)) | (1L << (DEBUG - 1)) | (1L << (EXECUTABLE - 1)) | (1L << (EXISTS - 1)) | (1L << (EXPLAIN - 1)) | (1L << (EXTRACT - 1)) | (1L << (FALSE - 1)) | (1L << (FIRST - 1)) | (1L << (FORMAT - 1)) | (1L << (FULL - 1)) | (1L << (FUNCTIONS - 1)) | (1L << (GRAPHVIZ - 1)) | (1L << (HOUR - 1)) | (1L << (INTERVAL - 1)) | (1L << (LAST - 1)) | (1L << (LEFT - 1)) | (1L << (LIMIT - 1)) | (1L << (MAPPED - 1)) | (1L << (MATCH - 1)) | (1L << (MINUTE - 1)) | (1L << (MONTH - 1)) | (1L << (NOT - 1)) | (1L << (NULL - 1)))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RIGHT - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TRUE - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)) | (1L << (FUNCTION_ESC - 67)) | (1L << (DATE_ESC - 67)) | (1L << (TIME_ESC - 67)) | (1L << (TIMESTAMP_ESC - 67)) | (1L << (GUID_ESC - 67)) | (1L << (PLUS - 67)) | (1L << (MINUS - 67)) | (1L << (ASTERISK - 67)) | (1L << (PARAM - 67)) | (1L << (STRING - 67)) | (1L << (INTEGER_VALUE - 67)) | (1L << (DECIMAL_VALUE - 67)) | (1L << (IDENTIFIER - 67)) | (1L << (DIGIT_IDENTIFIER - 67)) | (1L << (QUOTED_IDENTIFIER - 67)) | (1L << (BACKQUOTED_IDENTIFIER - 67)))) != 0)) {
+          {
+          setState(593);
+          ((CaseContext)_localctx).operand = booleanExpression(0);
+          }
+        }
+
+        setState(597); 
+        _errHandler.sync(this);
+        _la = _input.LA(1);
+        do {
+          {
+          {
+          setState(596);
+          whenClause();
+          }
+          }
+          setState(599); 
+          _errHandler.sync(this);
+          _la = _input.LA(1);
+        } while ( _la==WHEN );
+        setState(603);
+        _la = _input.LA(1);
+        if (_la==ELSE) {
+          {
+          setState(601);
+          match(ELSE);
+          setState(602);
+          ((CaseContext)_localctx).elseClause = booleanExpression(0);
+          }
+        }
+
+        setState(605);
+        match(END);
+        }
+        break;
       }
       _ctx.stop = _input.LT(-1);
-      setState(597);
+      setState(614);
       _errHandler.sync(this);
-      _alt = getInterpreter().adaptivePredict(_input,80,_ctx);
+      _alt = getInterpreter().adaptivePredict(_input,83,_ctx);
       while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
         if ( _alt==1 ) {
           if ( _parseListeners!=null ) triggerExitRuleEvent();
@@ -4337,18 +4418,18 @@ class SqlBaseParser extends Parser {
           {
           _localctx = new CastOperatorExpressionContext(new PrimaryExpressionContext(_parentctx, _parentState));
           pushNewRecursionContext(_localctx, _startState, RULE_primaryExpression);
-          setState(592);
-          if (!(precpred(_ctx, 9))) throw new FailedPredicateException(this, "precpred(_ctx, 9)");
-          setState(593);
+          setState(609);
+          if (!(precpred(_ctx, 10))) throw new FailedPredicateException(this, "precpred(_ctx, 10)");
+          setState(610);
           match(CAST_OP);
-          setState(594);
+          setState(611);
           dataType();
           }
           } 
         }
-        setState(599);
+        setState(616);
         _errHandler.sync(this);
-        _alt = getInterpreter().adaptivePredict(_input,80,_ctx);
+        _alt = getInterpreter().adaptivePredict(_input,83,_ctx);
       }
       }
     }
@@ -4391,26 +4472,26 @@ class SqlBaseParser extends Parser {
     BuiltinDateTimeFunctionContext _localctx = new BuiltinDateTimeFunctionContext(_ctx, getState());
     enterRule(_localctx, 62, RULE_builtinDateTimeFunction);
     try {
-      setState(603);
+      setState(620);
       switch (_input.LA(1)) {
       case CURRENT_TIMESTAMP:
         enterOuterAlt(_localctx, 1);
         {
-        setState(600);
+        setState(617);
         ((BuiltinDateTimeFunctionContext)_localctx).name = match(CURRENT_TIMESTAMP);
         }
         break;
       case CURRENT_DATE:
         enterOuterAlt(_localctx, 2);
         {
-        setState(601);
+        setState(618);
         ((BuiltinDateTimeFunctionContext)_localctx).name = match(CURRENT_DATE);
         }
         break;
       case CURRENT_TIME:
         enterOuterAlt(_localctx, 3);
         {
-        setState(602);
+        setState(619);
         ((BuiltinDateTimeFunctionContext)_localctx).name = match(CURRENT_TIME);
         }
         break;
@@ -4461,42 +4542,42 @@ class SqlBaseParser extends Parser {
     CastExpressionContext _localctx = new CastExpressionContext(_ctx, getState());
     enterRule(_localctx, 64, RULE_castExpression);
     try {
-      setState(615);
+      setState(632);
       _errHandler.sync(this);
-      switch ( getInterpreter().adaptivePredict(_input,82,_ctx) ) {
+      switch ( getInterpreter().adaptivePredict(_input,85,_ctx) ) {
       case 1:
         enterOuterAlt(_localctx, 1);
         {
-        setState(605);
+        setState(622);
         castTemplate();
         }
         break;
       case 2:
         enterOuterAlt(_localctx, 2);
         {
-        setState(606);
+        setState(623);
         match(FUNCTION_ESC);
-        setState(607);
+        setState(624);
         castTemplate();
-        setState(608);
+        setState(625);
         match(ESC_END);
         }
         break;
       case 3:
         enterOuterAlt(_localctx, 3);
         {
-        setState(610);
+        setState(627);
         convertTemplate();
         }
         break;
       case 4:
         enterOuterAlt(_localctx, 4);
         {
-        setState(611);
+        setState(628);
         match(FUNCTION_ESC);
-        setState(612);
+        setState(629);
         convertTemplate();
-        setState(613);
+        setState(630);
         match(ESC_END);
         }
         break;
@@ -4547,17 +4628,17 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(617);
+      setState(634);
       match(CAST);
-      setState(618);
+      setState(635);
       match(T__0);
-      setState(619);
+      setState(636);
       expression();
-      setState(620);
+      setState(637);
       match(AS);
-      setState(621);
+      setState(638);
       dataType();
-      setState(622);
+      setState(639);
       match(T__1);
       }
     }
@@ -4605,17 +4686,17 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(624);
+      setState(641);
       match(CONVERT);
-      setState(625);
+      setState(642);
       match(T__0);
-      setState(626);
+      setState(643);
       expression();
-      setState(627);
+      setState(644);
       match(T__2);
-      setState(628);
+      setState(645);
       dataType();
-      setState(629);
+      setState(646);
       match(T__1);
       }
     }
@@ -4659,23 +4740,23 @@ class SqlBaseParser extends Parser {
     ExtractExpressionContext _localctx = new ExtractExpressionContext(_ctx, getState());
     enterRule(_localctx, 70, RULE_extractExpression);
     try {
-      setState(636);
+      setState(653);
       switch (_input.LA(1)) {
       case EXTRACT:
         enterOuterAlt(_localctx, 1);
         {
-        setState(631);
+        setState(648);
         extractTemplate();
         }
         break;
       case FUNCTION_ESC:
         enterOuterAlt(_localctx, 2);
         {
-        setState(632);
+        setState(649);
         match(FUNCTION_ESC);
-        setState(633);
+        setState(650);
         extractTemplate();
-        setState(634);
+        setState(651);
         match(ESC_END);
         }
         break;
@@ -4729,17 +4810,17 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(638);
+      setState(655);
       match(EXTRACT);
-      setState(639);
+      setState(656);
       match(T__0);
-      setState(640);
+      setState(657);
       ((ExtractTemplateContext)_localctx).field = identifier();
-      setState(641);
+      setState(658);
       match(FROM);
-      setState(642);
+      setState(659);
       valueExpression(0);
-      setState(643);
+      setState(660);
       match(T__1);
       }
     }
@@ -4782,7 +4863,7 @@ class SqlBaseParser extends Parser {
     FunctionExpressionContext _localctx = new FunctionExpressionContext(_ctx, getState());
     enterRule(_localctx, 74, RULE_functionExpression);
     try {
-      setState(650);
+      setState(667);
       switch (_input.LA(1)) {
       case ANALYZE:
       case ANALYZED:
@@ -4831,18 +4912,18 @@ class SqlBaseParser extends Parser {
       case BACKQUOTED_IDENTIFIER:
         enterOuterAlt(_localctx, 1);
         {
-        setState(645);
+        setState(662);
         functionTemplate();
         }
         break;
       case FUNCTION_ESC:
         enterOuterAlt(_localctx, 2);
         {
-        setState(646);
+        setState(663);
         match(FUNCTION_ESC);
-        setState(647);
+        setState(664);
         functionTemplate();
-        setState(648);
+        setState(665);
         match(ESC_END);
         }
         break;
@@ -4900,45 +4981,45 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(652);
+      setState(669);
       functionName();
-      setState(653);
+      setState(670);
       match(T__0);
-      setState(665);
+      setState(682);
       _la = _input.LA(1);
-      if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__0) | (1L << ALL) | (1L << ANALYZE) | (1L << ANALYZED) | (1L << CAST) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CONVERT) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << DISTINCT) | (1L << EXECUTABLE) | (1L << EXISTS) | (1L << EXPLAIN) | (1L << EXTRACT) | (1L << FALSE) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LEFT) | (1L << LIMIT) | (1L << MAPPED) | (1L << MATCH) | (1L << MINUTE) | (1L << MONTH) | (1L << NOT) | (1L << NULL))) != 0) || ((((_la - 64)) & ~0x3f) == 0 && ((1L << (_la - 64)) & ((1L << (OPTIMIZED - 64)) | (1L << (PARSED - 64)) | (1L << (PHYSICAL - 64)) | (1L << (PLAN - 64)) | (1L << (RIGHT - 64)) | (1L << (RLIKE - 64)) | (1L << (QUERY - 64)) | (1L << (SCHEMAS - 64)) | (1L << (SECOND - 64)) | (1L << (SHOW - 64)) | (1L << (SYS - 64)) | (1L << (TABLES - 64)) | (1L << (TEXT - 64)) | (1L << (TRUE - 64)) | (1L << (TYPE - 64)) | (1L << (TYPES - 64)) | (1L << (VERIFY - 64)) | (1L << (YEAR - 64)) | (1L << (FUNCTION_ESC - 64)) | (1L << (DATE_ESC - 64)) | (1L << (TIME_ESC - 64)) | (1L << (TIMESTAMP_ESC - 64)) | (1L << (GUID_ESC - 64)) | (1L << (PLUS - 64)) | (1L << (MINUS - 64)) | (1L << (ASTERISK - 64)) | (1L << (PARAM - 64)) | (1L << (STRING - 64)) | (1L << (INTEGER_VALUE - 64)) | (1L << (DECIMAL_VALUE - 64)) | (1L << (IDENTIFIER - 64)) | (1L << (DIGIT_IDENTIFIER - 64)) | (1L << (QUOTED_IDENTIFIER - 64)) | (1L << (BACKQUOTED_IDENTIFIER - 64)))) != 0)) {
+      if (((((_la - 1)) & ~0x3f) == 0 && ((1L << (_la - 1)) & ((1L << (T__0 - 1)) | (1L << (ALL - 1)) | (1L << (ANALYZE - 1)) | (1L << (ANALYZED - 1)) | (1L << (CASE - 1)) | (1L << (CAST - 1)) | (1L << (CATALOGS - 1)) | (1L << (COLUMNS - 1)) | (1L << (CONVERT - 1)) | (1L << (CURRENT_DATE - 1)) | (1L << (CURRENT_TIME - 1)) | (1L << (CURRENT_TIMESTAMP - 1)) | (1L << (DAY - 1)) | (1L << (DEBUG - 1)) | (1L << (DISTINCT - 1)) | (1L << (EXECUTABLE - 1)) | (1L << (EXISTS - 1)) | (1L << (EXPLAIN - 1)) | (1L << (EXTRACT - 1)) | (1L << (FALSE - 1)) | (1L << (FIRST - 1)) | (1L << (FORMAT - 1)) | (1L << (FULL - 1)) | (1L << (FUNCTIONS - 1)) | (1L << (GRAPHVIZ - 1)) | (1L << (HOUR - 1)) | (1L << (INTERVAL - 1)) | (1L << (LAST - 1)) | (1L << (LEFT - 1)) | (1L << (LIMIT - 1)) | (1L << (MAPPED - 1)) | (1L << (MATCH - 1)) | (1L << (MINUTE - 1)) | (1L << (MONTH - 1)) | (1L << (NOT - 1)) | (1L << (NULL - 1)))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RIGHT - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TRUE - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)) | (1L << (FUNCTION_ESC - 67)) | (1L << (DATE_ESC - 67)) | (1L << (TIME_ESC - 67)) | (1L << (TIMESTAMP_ESC - 67)) | (1L << (GUID_ESC - 67)) | (1L << (PLUS - 67)) | (1L << (MINUS - 67)) | (1L << (ASTERISK - 67)) | (1L << (PARAM - 67)) | (1L << (STRING - 67)) | (1L << (INTEGER_VALUE - 67)) | (1L << (DECIMAL_VALUE - 67)) | (1L << (IDENTIFIER - 67)) | (1L << (DIGIT_IDENTIFIER - 67)) | (1L << (QUOTED_IDENTIFIER - 67)) | (1L << (BACKQUOTED_IDENTIFIER - 67)))) != 0)) {
         {
-        setState(655);
+        setState(672);
         _la = _input.LA(1);
         if (_la==ALL || _la==DISTINCT) {
           {
-          setState(654);
+          setState(671);
           setQuantifier();
           }
         }
 
-        setState(657);
+        setState(674);
         expression();
-        setState(662);
+        setState(679);
         _errHandler.sync(this);
         _la = _input.LA(1);
         while (_la==T__2) {
           {
           {
-          setState(658);
+          setState(675);
           match(T__2);
-          setState(659);
+          setState(676);
           expression();
           }
           }
-          setState(664);
+          setState(681);
           _errHandler.sync(this);
           _la = _input.LA(1);
         }
         }
       }
 
-      setState(667);
+      setState(684);
       match(T__1);
       }
     }
@@ -4982,19 +5063,19 @@ class SqlBaseParser extends Parser {
     FunctionNameContext _localctx = new FunctionNameContext(_ctx, getState());
     enterRule(_localctx, 78, RULE_functionName);
     try {
-      setState(672);
+      setState(689);
       switch (_input.LA(1)) {
       case LEFT:
         enterOuterAlt(_localctx, 1);
         {
-        setState(669);
+        setState(686);
         match(LEFT);
         }
         break;
       case RIGHT:
         enterOuterAlt(_localctx, 2);
         {
-        setState(670);
+        setState(687);
         match(RIGHT);
         }
         break;
@@ -5043,7 +5124,7 @@ class SqlBaseParser extends Parser {
       case BACKQUOTED_IDENTIFIER:
         enterOuterAlt(_localctx, 3);
         {
-        setState(671);
+        setState(688);
         identifier();
         }
         break;
@@ -5274,13 +5355,13 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 80, RULE_constant);
     try {
       int _alt;
-      setState(700);
+      setState(717);
       switch (_input.LA(1)) {
       case NULL:
         _localctx = new NullLiteralContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(674);
+        setState(691);
         match(NULL);
         }
         break;
@@ -5288,7 +5369,7 @@ class SqlBaseParser extends Parser {
         _localctx = new IntervalLiteralContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(675);
+        setState(692);
         interval();
         }
         break;
@@ -5297,7 +5378,7 @@ class SqlBaseParser extends Parser {
         _localctx = new NumericLiteralContext(_localctx);
         enterOuterAlt(_localctx, 3);
         {
-        setState(676);
+        setState(693);
         number();
         }
         break;
@@ -5306,7 +5387,7 @@ class SqlBaseParser extends Parser {
         _localctx = new BooleanLiteralContext(_localctx);
         enterOuterAlt(_localctx, 4);
         {
-        setState(677);
+        setState(694);
         booleanValue();
         }
         break;
@@ -5314,7 +5395,7 @@ class SqlBaseParser extends Parser {
         _localctx = new StringLiteralContext(_localctx);
         enterOuterAlt(_localctx, 5);
         {
-        setState(679); 
+        setState(696); 
         _errHandler.sync(this);
         _alt = 1;
         do {
@@ -5322,7 +5403,7 @@ class SqlBaseParser extends Parser {
           case 1:
             {
             {
-            setState(678);
+            setState(695);
             match(STRING);
             }
             }
@@ -5330,9 +5411,9 @@ class SqlBaseParser extends Parser {
           default:
             throw new NoViableAltException(this);
           }
-          setState(681); 
+          setState(698); 
           _errHandler.sync(this);
-          _alt = getInterpreter().adaptivePredict(_input,89,_ctx);
+          _alt = getInterpreter().adaptivePredict(_input,92,_ctx);
         } while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER );
         }
         break;
@@ -5340,7 +5421,7 @@ class SqlBaseParser extends Parser {
         _localctx = new ParamLiteralContext(_localctx);
         enterOuterAlt(_localctx, 6);
         {
-        setState(683);
+        setState(700);
         match(PARAM);
         }
         break;
@@ -5348,11 +5429,11 @@ class SqlBaseParser extends Parser {
         _localctx = new DateEscapedLiteralContext(_localctx);
         enterOuterAlt(_localctx, 7);
         {
-        setState(684);
+        setState(701);
         match(DATE_ESC);
-        setState(685);
+        setState(702);
         string();
-        setState(686);
+        setState(703);
         match(ESC_END);
         }
         break;
@@ -5360,11 +5441,11 @@ class SqlBaseParser extends Parser {
         _localctx = new TimeEscapedLiteralContext(_localctx);
         enterOuterAlt(_localctx, 8);
         {
-        setState(688);
+        setState(705);
         match(TIME_ESC);
-        setState(689);
+        setState(706);
         string();
-        setState(690);
+        setState(707);
         match(ESC_END);
         }
         break;
@@ -5372,11 +5453,11 @@ class SqlBaseParser extends Parser {
         _localctx = new TimestampEscapedLiteralContext(_localctx);
         enterOuterAlt(_localctx, 9);
         {
-        setState(692);
+        setState(709);
         match(TIMESTAMP_ESC);
-        setState(693);
+        setState(710);
         string();
-        setState(694);
+        setState(711);
         match(ESC_END);
         }
         break;
@@ -5384,11 +5465,11 @@ class SqlBaseParser extends Parser {
         _localctx = new GuidEscapedLiteralContext(_localctx);
         enterOuterAlt(_localctx, 10);
         {
-        setState(696);
+        setState(713);
         match(GUID_ESC);
-        setState(697);
+        setState(714);
         string();
-        setState(698);
+        setState(715);
         match(ESC_END);
         }
         break;
@@ -5441,9 +5522,9 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(702);
+      setState(719);
       _la = _input.LA(1);
-      if ( !(((((_la - 101)) & ~0x3f) == 0 && ((1L << (_la - 101)) & ((1L << (EQ - 101)) | (1L << (NULLEQ - 101)) | (1L << (NEQ - 101)) | (1L << (LT - 101)) | (1L << (LTE - 101)) | (1L << (GT - 101)) | (1L << (GTE - 101)))) != 0)) ) {
+      if ( !(((((_la - 106)) & ~0x3f) == 0 && ((1L << (_la - 106)) & ((1L << (EQ - 106)) | (1L << (NULLEQ - 106)) | (1L << (NEQ - 106)) | (1L << (LT - 106)) | (1L << (LTE - 106)) | (1L << (GT - 106)) | (1L << (GTE - 106)))) != 0)) ) {
       _errHandler.recoverInline(this);
       } else {
         consume();
@@ -5490,7 +5571,7 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(704);
+      setState(721);
       _la = _input.LA(1);
       if ( !(_la==FALSE || _la==TRUE) ) {
       _errHandler.recoverInline(this);
@@ -5558,13 +5639,13 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(706);
+      setState(723);
       match(INTERVAL);
-      setState(708);
+      setState(725);
       _la = _input.LA(1);
       if (_la==PLUS || _la==MINUS) {
         {
-        setState(707);
+        setState(724);
         ((IntervalContext)_localctx).sign = _input.LT(1);
         _la = _input.LA(1);
         if ( !(_la==PLUS || _la==MINUS) ) {
@@ -5575,35 +5656,35 @@ class SqlBaseParser extends Parser {
         }
       }
 
-      setState(712);
+      setState(729);
       switch (_input.LA(1)) {
       case INTEGER_VALUE:
       case DECIMAL_VALUE:
         {
-        setState(710);
+        setState(727);
         ((IntervalContext)_localctx).valueNumeric = number();
         }
         break;
       case PARAM:
       case STRING:
         {
-        setState(711);
+        setState(728);
         ((IntervalContext)_localctx).valuePattern = string();
         }
         break;
       default:
         throw new NoViableAltException(this);
       }
-      setState(714);
+      setState(731);
       ((IntervalContext)_localctx).leading = intervalField();
-      setState(717);
+      setState(734);
       _errHandler.sync(this);
-      switch ( getInterpreter().adaptivePredict(_input,93,_ctx) ) {
+      switch ( getInterpreter().adaptivePredict(_input,96,_ctx) ) {
       case 1:
         {
-        setState(715);
+        setState(732);
         match(TO);
-        setState(716);
+        setState(733);
         ((IntervalContext)_localctx).trailing = intervalField();
         }
         break;
@@ -5660,9 +5741,9 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(719);
+      setState(736);
       _la = _input.LA(1);
-      if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << DAY) | (1L << DAYS) | (1L << HOUR) | (1L << HOURS) | (1L << MINUTE) | (1L << MINUTES) | (1L << MONTH) | (1L << MONTHS))) != 0) || ((((_la - 75)) & ~0x3f) == 0 && ((1L << (_la - 75)) & ((1L << (SECOND - 75)) | (1L << (SECONDS - 75)) | (1L << (YEAR - 75)) | (1L << (YEARS - 75)))) != 0)) ) {
+      if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << DAY) | (1L << DAYS) | (1L << HOUR) | (1L << HOURS) | (1L << MINUTE) | (1L << MINUTES) | (1L << MONTH) | (1L << MONTHS))) != 0) || ((((_la - 78)) & ~0x3f) == 0 && ((1L << (_la - 78)) & ((1L << (SECOND - 78)) | (1L << (SECONDS - 78)) | (1L << (YEAR - 78)) | (1L << (YEARS - 78)))) != 0)) ) {
       _errHandler.recoverInline(this);
       } else {
         consume();
@@ -5718,7 +5799,7 @@ class SqlBaseParser extends Parser {
       _localctx = new PrimitiveDataTypeContext(_localctx);
       enterOuterAlt(_localctx, 1);
       {
-      setState(721);
+      setState(738);
       identifier();
       }
     }
@@ -5770,25 +5851,25 @@ class SqlBaseParser extends Parser {
       int _alt;
       enterOuterAlt(_localctx, 1);
       {
-      setState(728);
+      setState(745);
       _errHandler.sync(this);
-      _alt = getInterpreter().adaptivePredict(_input,94,_ctx);
+      _alt = getInterpreter().adaptivePredict(_input,97,_ctx);
       while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
         if ( _alt==1 ) {
           {
           {
-          setState(723);
+          setState(740);
           identifier();
-          setState(724);
+          setState(741);
           match(DOT);
           }
           } 
         }
-        setState(730);
+        setState(747);
         _errHandler.sync(this);
-        _alt = getInterpreter().adaptivePredict(_input,94,_ctx);
+        _alt = getInterpreter().adaptivePredict(_input,97,_ctx);
       }
-      setState(731);
+      setState(748);
       identifier();
       }
     }
@@ -5833,13 +5914,13 @@ class SqlBaseParser extends Parser {
     IdentifierContext _localctx = new IdentifierContext(_ctx, getState());
     enterRule(_localctx, 94, RULE_identifier);
     try {
-      setState(735);
+      setState(752);
       switch (_input.LA(1)) {
       case QUOTED_IDENTIFIER:
       case BACKQUOTED_IDENTIFIER:
         enterOuterAlt(_localctx, 1);
         {
-        setState(733);
+        setState(750);
         quoteIdentifier();
         }
         break;
@@ -5886,7 +5967,7 @@ class SqlBaseParser extends Parser {
       case DIGIT_IDENTIFIER:
         enterOuterAlt(_localctx, 2);
         {
-        setState(734);
+        setState(751);
         unquoteIdentifier();
         }
         break;
@@ -5939,43 +6020,43 @@ class SqlBaseParser extends Parser {
     enterRule(_localctx, 96, RULE_tableIdentifier);
     int _la;
     try {
-      setState(749);
+      setState(766);
       _errHandler.sync(this);
-      switch ( getInterpreter().adaptivePredict(_input,98,_ctx) ) {
+      switch ( getInterpreter().adaptivePredict(_input,101,_ctx) ) {
       case 1:
         enterOuterAlt(_localctx, 1);
         {
-        setState(740);
+        setState(757);
         _la = _input.LA(1);
-        if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 64)) & ~0x3f) == 0 && ((1L << (_la - 64)) & ((1L << (OPTIMIZED - 64)) | (1L << (PARSED - 64)) | (1L << (PHYSICAL - 64)) | (1L << (PLAN - 64)) | (1L << (RLIKE - 64)) | (1L << (QUERY - 64)) | (1L << (SCHEMAS - 64)) | (1L << (SECOND - 64)) | (1L << (SHOW - 64)) | (1L << (SYS - 64)) | (1L << (TABLES - 64)) | (1L << (TEXT - 64)) | (1L << (TYPE - 64)) | (1L << (TYPES - 64)) | (1L << (VERIFY - 64)) | (1L << (YEAR - 64)) | (1L << (IDENTIFIER - 64)) | (1L << (DIGIT_IDENTIFIER - 64)) | (1L << (QUOTED_IDENTIFIER - 64)) | (1L << (BACKQUOTED_IDENTIFIER - 64)))) != 0)) {
+        if ((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)) | (1L << (IDENTIFIER - 67)) | (1L << (DIGIT_IDENTIFIER - 67)) | (1L << (QUOTED_IDENTIFIER - 67)) | (1L << (BACKQUOTED_IDENTIFIER - 67)))) != 0)) {
           {
-          setState(737);
+          setState(754);
           ((TableIdentifierContext)_localctx).catalog = identifier();
-          setState(738);
+          setState(755);
           match(T__3);
           }
         }
 
-        setState(742);
+        setState(759);
         match(TABLE_IDENTIFIER);
         }
         break;
       case 2:
         enterOuterAlt(_localctx, 2);
         {
-        setState(746);
+        setState(763);
         _errHandler.sync(this);
-        switch ( getInterpreter().adaptivePredict(_input,97,_ctx) ) {
+        switch ( getInterpreter().adaptivePredict(_input,100,_ctx) ) {
         case 1:
           {
-          setState(743);
+          setState(760);
           ((TableIdentifierContext)_localctx).catalog = identifier();
-          setState(744);
+          setState(761);
           match(T__3);
           }
           break;
         }
-        setState(748);
+        setState(765);
         ((TableIdentifierContext)_localctx).name = identifier();
         }
         break;
@@ -6042,13 +6123,13 @@ class SqlBaseParser extends Parser {
     QuoteIdentifierContext _localctx = new QuoteIdentifierContext(_ctx, getState());
     enterRule(_localctx, 98, RULE_quoteIdentifier);
     try {
-      setState(753);
+      setState(770);
       switch (_input.LA(1)) {
       case QUOTED_IDENTIFIER:
         _localctx = new QuotedIdentifierContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(751);
+        setState(768);
         match(QUOTED_IDENTIFIER);
         }
         break;
@@ -6056,7 +6137,7 @@ class SqlBaseParser extends Parser {
         _localctx = new BackQuotedIdentifierContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(752);
+        setState(769);
         match(BACKQUOTED_IDENTIFIER);
         }
         break;
@@ -6128,13 +6209,13 @@ class SqlBaseParser extends Parser {
     UnquoteIdentifierContext _localctx = new UnquoteIdentifierContext(_ctx, getState());
     enterRule(_localctx, 100, RULE_unquoteIdentifier);
     try {
-      setState(758);
+      setState(775);
       switch (_input.LA(1)) {
       case IDENTIFIER:
         _localctx = new UnquotedIdentifierContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(755);
+        setState(772);
         match(IDENTIFIER);
         }
         break;
@@ -6180,7 +6261,7 @@ class SqlBaseParser extends Parser {
         _localctx = new UnquotedIdentifierContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(756);
+        setState(773);
         nonReserved();
         }
         break;
@@ -6188,7 +6269,7 @@ class SqlBaseParser extends Parser {
         _localctx = new DigitIdentifierContext(_localctx);
         enterOuterAlt(_localctx, 3);
         {
-        setState(757);
+        setState(774);
         match(DIGIT_IDENTIFIER);
         }
         break;
@@ -6257,13 +6338,13 @@ class SqlBaseParser extends Parser {
     NumberContext _localctx = new NumberContext(_ctx, getState());
     enterRule(_localctx, 102, RULE_number);
     try {
-      setState(762);
+      setState(779);
       switch (_input.LA(1)) {
       case DECIMAL_VALUE:
         _localctx = new DecimalLiteralContext(_localctx);
         enterOuterAlt(_localctx, 1);
         {
-        setState(760);
+        setState(777);
         match(DECIMAL_VALUE);
         }
         break;
@@ -6271,7 +6352,7 @@ class SqlBaseParser extends Parser {
         _localctx = new IntegerLiteralContext(_localctx);
         enterOuterAlt(_localctx, 2);
         {
-        setState(761);
+        setState(778);
         match(INTEGER_VALUE);
         }
         break;
@@ -6319,7 +6400,7 @@ class SqlBaseParser extends Parser {
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(764);
+      setState(781);
       _la = _input.LA(1);
       if ( !(_la==PARAM || _la==STRING) ) {
       _errHandler.recoverInline(this);
@@ -6339,6 +6420,63 @@ class SqlBaseParser extends Parser {
     return _localctx;
   }
 
+  public static class WhenClauseContext extends ParserRuleContext {
+    public ExpressionContext condition;
+    public ExpressionContext result;
+    public TerminalNode WHEN() { return getToken(SqlBaseParser.WHEN, 0); }
+    public TerminalNode THEN() { return getToken(SqlBaseParser.THEN, 0); }
+    public List<ExpressionContext> expression() {
+      return getRuleContexts(ExpressionContext.class);
+    }
+    public ExpressionContext expression(int i) {
+      return getRuleContext(ExpressionContext.class,i);
+    }
+    public WhenClauseContext(ParserRuleContext parent, int invokingState) {
+      super(parent, invokingState);
+    }
+    @Override public int getRuleIndex() { return RULE_whenClause; }
+    @Override
+    public void enterRule(ParseTreeListener listener) {
+      if ( listener instanceof SqlBaseListener ) ((SqlBaseListener)listener).enterWhenClause(this);
+    }
+    @Override
+    public void exitRule(ParseTreeListener listener) {
+      if ( listener instanceof SqlBaseListener ) ((SqlBaseListener)listener).exitWhenClause(this);
+    }
+    @Override
+    public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+      if ( visitor instanceof SqlBaseVisitor ) return ((SqlBaseVisitor<? extends T>)visitor).visitWhenClause(this);
+      else return visitor.visitChildren(this);
+    }
+  }
+
+  public final WhenClauseContext whenClause() throws RecognitionException {
+    WhenClauseContext _localctx = new WhenClauseContext(_ctx, getState());
+    enterRule(_localctx, 106, RULE_whenClause);
+    try {
+      enterOuterAlt(_localctx, 1);
+      {
+      setState(783);
+      match(WHEN);
+      setState(784);
+      ((WhenClauseContext)_localctx).condition = expression();
+      setState(785);
+      match(THEN);
+      setState(786);
+      ((WhenClauseContext)_localctx).result = expression();
+      }
+    }
+    catch (RecognitionException re) {
+      _localctx.exception = re;
+      _errHandler.reportError(this, re);
+      _errHandler.recover(this, re);
+    }
+    finally {
+      exitRule();
+    }
+    return _localctx;
+  }
+
   public static class NonReservedContext extends ParserRuleContext {
     public TerminalNode ANALYZE() { return getToken(SqlBaseParser.ANALYZE, 0); }
     public TerminalNode ANALYZED() { return getToken(SqlBaseParser.ANALYZED, 0); }
@@ -6400,14 +6538,14 @@ class SqlBaseParser extends Parser {
 
   public final NonReservedContext nonReserved() throws RecognitionException {
     NonReservedContext _localctx = new NonReservedContext(_ctx, getState());
-    enterRule(_localctx, 106, RULE_nonReserved);
+    enterRule(_localctx, 108, RULE_nonReserved);
     int _la;
     try {
       enterOuterAlt(_localctx, 1);
       {
-      setState(766);
+      setState(788);
       _la = _input.LA(1);
-      if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 64)) & ~0x3f) == 0 && ((1L << (_la - 64)) & ((1L << (OPTIMIZED - 64)) | (1L << (PARSED - 64)) | (1L << (PHYSICAL - 64)) | (1L << (PLAN - 64)) | (1L << (RLIKE - 64)) | (1L << (QUERY - 64)) | (1L << (SCHEMAS - 64)) | (1L << (SECOND - 64)) | (1L << (SHOW - 64)) | (1L << (SYS - 64)) | (1L << (TABLES - 64)) | (1L << (TEXT - 64)) | (1L << (TYPE - 64)) | (1L << (TYPES - 64)) | (1L << (VERIFY - 64)) | (1L << (YEAR - 64)))) != 0)) ) {
+      if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << ANALYZE) | (1L << ANALYZED) | (1L << CATALOGS) | (1L << COLUMNS) | (1L << CURRENT_DATE) | (1L << CURRENT_TIME) | (1L << CURRENT_TIMESTAMP) | (1L << DAY) | (1L << DEBUG) | (1L << EXECUTABLE) | (1L << EXPLAIN) | (1L << FIRST) | (1L << FORMAT) | (1L << FULL) | (1L << FUNCTIONS) | (1L << GRAPHVIZ) | (1L << HOUR) | (1L << INTERVAL) | (1L << LAST) | (1L << LIMIT) | (1L << MAPPED) | (1L << MINUTE) | (1L << MONTH))) != 0) || ((((_la - 67)) & ~0x3f) == 0 && ((1L << (_la - 67)) & ((1L << (OPTIMIZED - 67)) | (1L << (PARSED - 67)) | (1L << (PHYSICAL - 67)) | (1L << (PLAN - 67)) | (1L << (RLIKE - 67)) | (1L << (QUERY - 67)) | (1L << (SCHEMAS - 67)) | (1L << (SECOND - 67)) | (1L << (SHOW - 67)) | (1L << (SYS - 67)) | (1L << (TABLES - 67)) | (1L << (TEXT - 67)) | (1L << (TYPE - 67)) | (1L << (TYPES - 67)) | (1L << (VERIFY - 67)) | (1L << (YEAR - 67)))) != 0)) ) {
       _errHandler.recoverInline(this);
       } else {
         consume();
@@ -6459,317 +6597,328 @@ class SqlBaseParser extends Parser {
   private boolean primaryExpression_sempred(PrimaryExpressionContext _localctx, int predIndex) {
     switch (predIndex) {
     case 5:
-      return precpred(_ctx, 9);
+      return precpred(_ctx, 10);
     }
     return true;
   }
 
   public static final String _serializedATN =
-    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\3\u0083\u0303\4\2\t"+
+    "\3\u0430\ud6d1\u8206\uad2d\u4417\uaef1\u8d80\uaadd\3\u0088\u0319\4\2\t"+
     "\2\4\3\t\3\4\4\t\4\4\5\t\5\4\6\t\6\4\7\t\7\4\b\t\b\4\t\t\t\4\n\t\n\4\13"+
     "\t\13\4\f\t\f\4\r\t\r\4\16\t\16\4\17\t\17\4\20\t\20\4\21\t\21\4\22\t\22"+
     "\4\23\t\23\4\24\t\24\4\25\t\25\4\26\t\26\4\27\t\27\4\30\t\30\4\31\t\31"+
     "\4\32\t\32\4\33\t\33\4\34\t\34\4\35\t\35\4\36\t\36\4\37\t\37\4 \t \4!"+
     "\t!\4\"\t\"\4#\t#\4$\t$\4%\t%\4&\t&\4\'\t\'\4(\t(\4)\t)\4*\t*\4+\t+\4"+
     ",\t,\4-\t-\4.\t.\4/\t/\4\60\t\60\4\61\t\61\4\62\t\62\4\63\t\63\4\64\t"+
-    "\64\4\65\t\65\4\66\t\66\4\67\t\67\3\2\3\2\3\2\3\3\3\3\3\3\3\4\3\4\3\4"+
-    "\3\4\3\4\3\4\3\4\3\4\3\4\7\4~\n\4\f\4\16\4\u0081\13\4\3\4\5\4\u0084\n"+
-    "\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\7\4\u008d\n\4\f\4\16\4\u0090\13\4\3\4\5"+
-    "\4\u0093\n\4\3\4\3\4\3\4\3\4\3\4\5\4\u009a\n\4\3\4\3\4\3\4\3\4\3\4\5\4"+
-    "\u00a1\n\4\3\4\3\4\3\4\5\4\u00a6\n\4\3\4\3\4\3\4\5\4\u00ab\n\4\3\4\3\4"+
-    "\3\4\3\4\3\4\3\4\5\4\u00b3\n\4\3\4\3\4\5\4\u00b7\n\4\3\4\3\4\3\4\3\4\7"+
-    "\4\u00bd\n\4\f\4\16\4\u00c0\13\4\5\4\u00c2\n\4\3\4\3\4\3\4\3\4\5\4\u00c8"+
-    "\n\4\3\4\3\4\3\4\5\4\u00cd\n\4\3\4\5\4\u00d0\n\4\3\4\3\4\3\4\5\4\u00d5"+
-    "\n\4\3\4\5\4\u00d8\n\4\5\4\u00da\n\4\3\5\3\5\3\5\3\5\7\5\u00e0\n\5\f\5"+
-    "\16\5\u00e3\13\5\5\5\u00e5\n\5\3\5\3\5\3\6\3\6\3\6\3\6\3\6\3\6\7\6\u00ef"+
-    "\n\6\f\6\16\6\u00f2\13\6\5\6\u00f4\n\6\3\6\5\6\u00f7\n\6\3\7\3\7\3\7\3"+
-    "\7\3\7\5\7\u00fe\n\7\3\b\3\b\3\b\3\b\3\b\5\b\u0105\n\b\3\t\3\t\5\t\u0109"+
-    "\n\t\3\t\3\t\5\t\u010d\n\t\3\n\3\n\5\n\u0111\n\n\3\n\3\n\3\n\7\n\u0116"+
-    "\n\n\f\n\16\n\u0119\13\n\3\n\5\n\u011c\n\n\3\n\3\n\5\n\u0120\n\n\3\n\3"+
-    "\n\3\n\5\n\u0125\n\n\3\n\3\n\5\n\u0129\n\n\3\13\3\13\3\13\3\13\7\13\u012f"+
-    "\n\13\f\13\16\13\u0132\13\13\3\f\5\f\u0135\n\f\3\f\3\f\3\f\7\f\u013a\n"+
-    "\f\f\f\16\f\u013d\13\f\3\r\3\r\3\16\3\16\3\16\3\16\7\16\u0145\n\16\f\16"+
-    "\16\16\u0148\13\16\5\16\u014a\n\16\3\16\3\16\5\16\u014e\n\16\3\17\3\17"+
-    "\3\17\3\17\3\17\3\17\3\20\3\20\3\21\3\21\5\21\u015a\n\21\3\21\5\21\u015d"+
-    "\n\21\3\22\3\22\7\22\u0161\n\22\f\22\16\22\u0164\13\22\3\23\3\23\3\23"+
-    "\3\23\5\23\u016a\n\23\3\23\3\23\3\23\3\23\3\23\5\23\u0171\n\23\3\24\5"+
-    "\24\u0174\n\24\3\24\3\24\5\24\u0178\n\24\3\24\3\24\5\24\u017c\n\24\3\24"+
-    "\3\24\5\24\u0180\n\24\5\24\u0182\n\24\3\25\3\25\3\25\3\25\3\25\3\25\3"+
-    "\25\7\25\u018b\n\25\f\25\16\25\u018e\13\25\3\25\3\25\5\25\u0192\n\25\3"+
-    "\26\3\26\5\26\u0196\n\26\3\26\5\26\u0199\n\26\3\26\3\26\3\26\3\26\5\26"+
-    "\u019f\n\26\3\26\5\26\u01a2\n\26\3\26\3\26\3\26\3\26\5\26\u01a8\n\26\3"+
-    "\26\5\26\u01ab\n\26\5\26\u01ad\n\26\3\27\3\27\3\30\3\30\3\30\3\30\3\30"+
+    "\64\4\65\t\65\4\66\t\66\4\67\t\67\48\t8\3\2\3\2\3\2\3\3\3\3\3\3\3\4\3"+
+    "\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\7\4\u0080\n\4\f\4\16\4\u0083\13\4\3\4\5"+
+    "\4\u0086\n\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\7\4\u008f\n\4\f\4\16\4\u0092"+
+    "\13\4\3\4\5\4\u0095\n\4\3\4\3\4\3\4\3\4\3\4\5\4\u009c\n\4\3\4\3\4\3\4"+
+    "\3\4\3\4\5\4\u00a3\n\4\3\4\3\4\3\4\5\4\u00a8\n\4\3\4\3\4\3\4\5\4\u00ad"+
+    "\n\4\3\4\3\4\3\4\3\4\3\4\3\4\5\4\u00b5\n\4\3\4\3\4\5\4\u00b9\n\4\3\4\3"+
+    "\4\3\4\3\4\7\4\u00bf\n\4\f\4\16\4\u00c2\13\4\5\4\u00c4\n\4\3\4\3\4\3\4"+
+    "\3\4\5\4\u00ca\n\4\3\4\3\4\3\4\5\4\u00cf\n\4\3\4\5\4\u00d2\n\4\3\4\3\4"+
+    "\3\4\5\4\u00d7\n\4\3\4\5\4\u00da\n\4\5\4\u00dc\n\4\3\5\3\5\3\5\3\5\7\5"+
+    "\u00e2\n\5\f\5\16\5\u00e5\13\5\5\5\u00e7\n\5\3\5\3\5\3\6\3\6\3\6\3\6\3"+
+    "\6\3\6\7\6\u00f1\n\6\f\6\16\6\u00f4\13\6\5\6\u00f6\n\6\3\6\5\6\u00f9\n"+
+    "\6\3\7\3\7\3\7\3\7\3\7\5\7\u0100\n\7\3\b\3\b\3\b\3\b\3\b\5\b\u0107\n\b"+
+    "\3\t\3\t\5\t\u010b\n\t\3\t\3\t\5\t\u010f\n\t\3\n\3\n\5\n\u0113\n\n\3\n"+
+    "\3\n\3\n\7\n\u0118\n\n\f\n\16\n\u011b\13\n\3\n\5\n\u011e\n\n\3\n\3\n\5"+
+    "\n\u0122\n\n\3\n\3\n\3\n\5\n\u0127\n\n\3\n\3\n\5\n\u012b\n\n\3\13\3\13"+
+    "\3\13\3\13\7\13\u0131\n\13\f\13\16\13\u0134\13\13\3\f\5\f\u0137\n\f\3"+
+    "\f\3\f\3\f\7\f\u013c\n\f\f\f\16\f\u013f\13\f\3\r\3\r\3\16\3\16\3\16\3"+
+    "\16\7\16\u0147\n\16\f\16\16\16\u014a\13\16\5\16\u014c\n\16\3\16\3\16\5"+
+    "\16\u0150\n\16\3\17\3\17\3\17\3\17\3\17\3\17\3\20\3\20\3\21\3\21\5\21"+
+    "\u015c\n\21\3\21\5\21\u015f\n\21\3\22\3\22\7\22\u0163\n\22\f\22\16\22"+
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+    "\u0148\5,\27\2\u0144\u0145\7\5\2\2\u0145\u0147\5,\27\2\u0146\u0144\3\2"+
+    "\2\2\u0147\u014a\3\2\2\2\u0148\u0146\3\2\2\2\u0148\u0149\3\2\2\2\u0149"+
+    "\u014c\3\2\2\2\u014a\u0148\3\2\2\2\u014b\u0143\3\2\2\2\u014b\u014c\3\2"+
+    "\2\2\u014c\u014d\3\2\2\2\u014d\u0150\7\4\2\2\u014e\u0150\5,\27\2\u014f"+
+    "\u0142\3\2\2\2\u014f\u014e\3\2\2\2\u0150\33\3\2\2\2\u0151\u0152\5`\61"+
+    "\2\u0152\u0153\7\f\2\2\u0153\u0154\7\3\2\2\u0154\u0155\5\n\6\2\u0155\u0156"+
+    "\7\4\2\2\u0156\35\3\2\2\2\u0157\u0158\t\13\2\2\u0158\37\3\2\2\2\u0159"+
+    "\u015e\5,\27\2\u015a\u015c\7\f\2\2\u015b\u015a\3\2\2\2\u015b\u015c\3\2"+
+    "\2\2\u015c\u015d\3\2\2\2\u015d\u015f\5`\61\2\u015e\u015b\3\2\2\2\u015e"+
+    "\u015f\3\2\2\2\u015f!\3\2\2\2\u0160\u0164\5*\26\2\u0161\u0163\5$\23\2"+
+    "\u0162\u0161\3\2\2\2\u0163\u0166\3\2\2\2\u0164\u0162\3\2\2\2\u0164\u0165"+
+    "\3\2\2\2\u0165#\3\2\2\2\u0166\u0164\3\2\2\2\u0167\u0168\5&\24\2\u0168"+
+    "\u0169\7\65\2\2\u0169\u016b\5*\26\2\u016a\u016c\5(\25\2\u016b\u016a\3"+
+    "\2\2\2\u016b\u016c\3\2\2\2\u016c\u0173\3\2\2\2\u016d\u016e\7@\2\2\u016e"+
+    "\u016f\5&\24\2\u016f\u0170\7\65\2\2\u0170\u0171\5*\26\2\u0171\u0173\3"+
+    "\2\2\2\u0172\u0167\3\2\2\2\u0172\u016d\3\2\2\2\u0173%\3\2\2\2\u0174\u0176"+
+    "\7\62\2\2\u0175\u0174\3\2\2\2\u0175\u0176\3\2\2\2\u0176\u0184\3\2\2\2"+
+    "\u0177\u0179\7\67\2\2\u0178\u017a\7H\2\2\u0179\u0178\3\2\2\2\u0179\u017a"+
+    "\3\2\2\2\u017a\u0184\3\2\2\2\u017b\u017d\7L\2\2\u017c\u017e\7H\2\2\u017d"+
+    "\u017c\3\2\2\2\u017d\u017e\3\2\2\2\u017e\u0184\3\2\2\2\u017f\u0181\7*"+
+    "\2\2\u0180\u0182\7H\2\2\u0181\u0180\3\2\2\2\u0181\u0182\3\2\2\2\u0182"+
+    "\u0184\3\2\2\2\u0183\u0175\3\2\2\2\u0183\u0177\3\2\2\2\u0183\u017b\3\2"+
+    "\2\2\u0183\u017f\3\2\2\2\u0184\'\3\2\2\2\u0185\u0186\7D\2\2\u0186\u0194"+
+    "\5.\30\2\u0187\u0188\7]\2\2\u0188\u0189\7\3\2\2\u0189\u018e\5`\61\2\u018a"+
+    "\u018b\7\5\2\2\u018b\u018d\5`\61\2\u018c\u018a\3\2\2\2\u018d\u0190\3\2"+
+    "\2\2\u018e\u018c\3\2\2\2\u018e\u018f\3\2\2\2\u018f\u0191\3\2\2\2\u0190"+
+    "\u018e\3\2\2\2\u0191\u0192\7\4\2\2\u0192\u0194\3\2\2\2\u0193\u0185\3\2"+
+    "\2\2\u0193\u0187\3\2\2\2\u0194)\3\2\2\2\u0195\u019a\5b\62\2\u0196\u0198"+
+    "\7\f\2\2\u0197\u0196\3\2\2\2\u0197\u0198\3\2\2\2\u0198\u0199\3\2\2\2\u0199"+
+    "\u019b\5^\60\2\u019a\u0197\3\2\2\2\u019a\u019b\3\2\2\2\u019b\u01af\3\2"+
+    "\2\2\u019c\u019d\7\3\2\2\u019d\u019e\5\n\6\2\u019e\u01a3\7\4\2\2\u019f"+
+    "\u01a1\7\f\2\2\u01a0\u019f\3\2\2\2\u01a0\u01a1\3\2\2\2\u01a1\u01a2\3\2"+
+    "\2\2\u01a2\u01a4\5^\60\2\u01a3\u01a0\3\2\2\2\u01a3\u01a4\3\2\2\2\u01a4"+
+    "\u01af\3\2\2\2\u01a5\u01a6\7\3\2\2\u01a6\u01a7\5\"\22\2\u01a7\u01ac\7"+
+    "\4\2\2\u01a8\u01aa\7\f\2\2\u01a9\u01a8\3\2\2\2\u01a9\u01aa\3\2\2\2\u01aa"+
+    "\u01ab\3\2\2\2\u01ab\u01ad\5^\60\2\u01ac\u01a9\3\2\2\2\u01ac\u01ad\3\2"+
+    "\2\2\u01ad\u01af\3\2\2\2\u01ae\u0195\3\2\2\2\u01ae\u019c\3\2\2\2\u01ae"+
+    "\u01a5\3\2\2\2\u01af+\3\2\2\2\u01b0\u01b1\5.\30\2\u01b1-\3\2\2\2\u01b2"+
+    "\u01b3\b\30\1\2\u01b3\u01b4\7A\2\2\u01b4\u01d2\5.\30\n\u01b5\u01b6\7#"+
+    "\2\2\u01b6\u01b7\7\3\2\2\u01b7\u01b8\5\b\5\2\u01b8\u01b9\7\4\2\2\u01b9"+
+    "\u01d2\3\2\2\2\u01ba\u01bb\7N\2\2\u01bb\u01bc\7\3\2\2\u01bc\u01bd\5j\66"+
+    "\2\u01bd\u01be\5\60\31\2\u01be\u01bf\7\4\2\2\u01bf\u01d2\3\2\2\2\u01c0"+
+    "\u01c1\7;\2\2\u01c1\u01c2\7\3\2\2\u01c2\u01c3\5^\60\2\u01c3\u01c4\7\5"+
+    "\2\2\u01c4\u01c5\5j\66\2\u01c5\u01c6\5\60\31\2\u01c6\u01c7\7\4\2\2\u01c7"+
+    "\u01d2\3\2\2\2\u01c8\u01c9\7;\2\2\u01c9\u01ca\7\3\2\2\u01ca\u01cb\5j\66"+
+    "\2\u01cb\u01cc\7\5\2\2\u01cc\u01cd\5j\66\2\u01cd\u01ce\5\60\31\2\u01ce"+
+    "\u01cf\7\4\2\2\u01cf\u01d2\3\2\2\2\u01d0\u01d2\5\62\32\2\u01d1\u01b2\3"+
+    "\2\2\2\u01d1\u01b5\3\2\2\2\u01d1\u01ba\3\2\2\2\u01d1\u01c0\3\2\2\2\u01d1"+
+    "\u01c8\3\2\2\2\u01d1\u01d0\3\2\2\2\u01d2\u01db\3\2\2\2\u01d3\u01d4\f\4"+
+    "\2\2\u01d4\u01d5\7\n\2\2\u01d5\u01da\5.\30\5\u01d6\u01d7\f\3\2\2\u01d7"+
+    "\u01d8\7F\2\2\u01d8\u01da\5.\30\4\u01d9\u01d3\3\2\2\2\u01d9\u01d6\3\2"+
+    "\2\2\u01da\u01dd\3\2\2\2\u01db\u01d9\3\2\2\2\u01db\u01dc\3\2\2\2\u01dc"+
+    "/\3\2\2\2\u01dd\u01db\3\2\2\2\u01de\u01df\7\5\2\2\u01df\u01e1\5j\66\2"+
+    "\u01e0\u01de\3\2\2\2\u01e1\u01e4\3\2\2\2\u01e2\u01e0\3\2\2\2\u01e2\u01e3"+
+    "\3\2\2\2\u01e3\61\3\2\2\2\u01e4\u01e2\3\2\2\2\u01e5\u01e7\5<\37\2\u01e6"+
+    "\u01e8\5\64\33\2\u01e7\u01e6\3\2\2\2\u01e7\u01e8\3\2\2\2\u01e8\63\3\2"+
+    "\2\2\u01e9\u01eb\7A\2\2\u01ea\u01e9\3\2\2\2\u01ea\u01eb\3\2\2\2\u01eb"+
+    "\u01ec\3\2\2\2\u01ec\u01ed\7\16\2\2\u01ed\u01ee\5<\37\2\u01ee\u01ef\7"+
+    "\n\2\2\u01ef\u01f0\5<\37\2\u01f0\u0218\3\2\2\2\u01f1\u01f3\7A\2\2\u01f2"+
+    "\u01f1\3\2\2\2\u01f2\u01f3\3\2\2\2\u01f3\u01f4\3\2\2\2\u01f4\u01f5\7\61"+
+    "\2\2\u01f5\u01f6\7\3\2\2\u01f6\u01fb\5<\37\2\u01f7\u01f8\7\5\2\2\u01f8"+
+    "\u01fa\5<\37\2\u01f9\u01f7\3\2\2\2\u01fa\u01fd\3\2\2\2\u01fb\u01f9\3\2"+
+    "\2\2\u01fb\u01fc\3\2\2\2\u01fc\u01fe\3\2\2\2\u01fd\u01fb\3\2\2\2\u01fe"+
+    "\u01ff\7\4\2\2\u01ff\u0218\3\2\2\2\u0200\u0202\7A\2\2\u0201\u0200\3\2"+
+    "\2\2\u0201\u0202\3\2\2\2\u0202\u0203\3\2\2\2\u0203\u0204\7\61\2\2\u0204"+
+    "\u0205\7\3\2\2\u0205\u0206\5\b\5\2\u0206\u0207\7\4\2\2\u0207\u0218\3\2"+
+    "\2\2\u0208\u020a\7A\2\2\u0209\u0208\3\2\2\2\u0209\u020a\3\2\2\2\u020a"+
+    "\u020b\3\2\2\2\u020b\u020c\78\2\2\u020c\u0218\58\35\2\u020d\u020f\7A\2"+
+    "\2\u020e\u020d\3\2\2\2\u020e\u020f\3\2\2\2\u020f\u0210\3\2\2\2\u0210\u0211"+
+    "\7M\2\2\u0211\u0218\5j\66\2\u0212\u0214\7\64\2\2\u0213\u0215\7A\2\2\u0214"+
+    "\u0213\3\2\2\2\u0214\u0215\3\2\2\2\u0215\u0216\3\2\2\2\u0216\u0218\7B"+
+    "\2\2\u0217\u01ea\3\2\2\2\u0217\u01f2\3\2\2\2\u0217\u0201\3\2\2\2\u0217"+
+    "\u0209\3\2\2\2\u0217\u020e\3\2\2\2\u0217\u0212\3\2\2\2\u0218\65\3\2\2"+
+    "\2\u0219\u021a\78\2\2\u021a\u021b\58\35\2\u021b\67\3\2\2\2\u021c\u021e"+
+    "\5j\66\2\u021d\u021f\5:\36\2\u021e\u021d\3\2\2\2\u021e\u021f\3\2\2\2\u021f"+
+    "9\3\2\2\2\u0220\u0221\7!\2\2\u0221\u0227\5j\66\2\u0222\u0223\7d\2\2\u0223"+
+    "\u0224\5j\66\2\u0224\u0225\7k\2\2\u0225\u0227\3\2\2\2\u0226\u0220\3\2"+
+    "\2\2\u0226\u0222\3\2\2\2\u0227;\3\2\2\2\u0228\u0229\b\37\1\2\u0229\u022d"+
+    "\5> \2\u022a\u022b\t\7\2\2\u022b\u022d\5<\37\6\u022c\u0228\3\2\2\2\u022c"+
+    "\u022a\3\2\2\2\u022d\u023a\3\2\2\2\u022e\u022f\f\5\2\2\u022f\u0230\t\f"+
+    "\2\2\u0230\u0239\5<\37\6\u0231\u0232\f\4\2\2\u0232\u0233\t\7\2\2\u0233"+
+    "\u0239\5<\37\5\u0234\u0235\f\3\2\2\u0235\u0236\5T+\2\u0236\u0237\5<\37"+
+    "\4\u0237\u0239\3\2\2\2\u0238\u022e\3\2\2\2\u0238\u0231\3\2\2\2\u0238\u0234"+
+    "\3\2\2\2\u0239\u023c\3\2\2\2\u023a\u0238\3\2\2\2\u023a\u023b\3\2\2\2\u023b"+
+    "=\3\2\2\2\u023c\u023a\3\2\2\2\u023d\u023e\b \1\2\u023e\u0262\5B\"\2\u023f"+
+    "\u0262\5H%\2\u0240\u0262\5@!\2\u0241\u0262\5R*\2\u0242\u0243\5^\60\2\u0243"+
+    "\u0244\7z\2\2\u0244\u0246\3\2\2\2\u0245\u0242\3\2\2\2\u0245\u0246\3\2"+
+    "\2\2\u0246\u0247\3\2\2\2\u0247\u0262\7u\2\2\u0248\u0262\5L\'\2\u0249\u024a"+
+    "\7\3\2\2\u024a\u024b\5\b\5\2\u024b\u024c\7\4\2\2\u024c\u0262\3\2\2\2\u024d"+
+    "\u0262\5^\60\2\u024e\u024f\7\3\2\2\u024f\u0250\5,\27\2\u0250\u0251\7\4"+
+    "\2\2\u0251\u0262\3\2\2\2\u0252\u0254\7\20\2\2\u0253\u0255\5.\30\2\u0254"+
+    "\u0253\3\2\2\2\u0254\u0255\3\2\2\2\u0255\u0257\3\2\2\2\u0256\u0258\5l"+
+    "\67\2\u0257\u0256\3\2\2\2\u0258\u0259\3\2\2\2\u0259\u0257\3\2\2\2\u0259"+
+    "\u025a\3\2\2\2\u025a\u025d\3\2\2\2\u025b\u025c\7\37\2\2\u025c\u025e\5"+
+    ".\30\2\u025d\u025b\3\2\2\2\u025d\u025e\3\2\2\2\u025e\u025f\3\2\2\2\u025f"+
+    "\u0260\7 \2\2\u0260\u0262\3\2\2\2\u0261\u023d\3\2\2\2\u0261\u023f\3\2"+
+    "\2\2\u0261\u0240\3\2\2\2\u0261\u0241\3\2\2\2\u0261\u0245\3\2\2\2\u0261"+
+    "\u0248\3\2\2\2\u0261\u0249\3\2\2\2\u0261\u024d\3\2\2\2\u0261\u024e\3\2"+
+    "\2\2\u0261\u0252\3\2\2\2\u0262\u0268\3\2\2\2\u0263\u0264\f\f\2\2\u0264"+
+    "\u0265\7x\2\2\u0265\u0267\5\\/\2\u0266\u0263\3\2\2\2\u0267\u026a\3\2\2"+
+    "\2\u0268\u0266\3\2\2\2\u0268\u0269\3\2\2\2\u0269?\3\2\2\2\u026a\u0268"+
+    "\3\2\2\2\u026b\u026f\7\30\2\2\u026c\u026f\7\26\2\2\u026d\u026f\7\27\2"+
+    "\2\u026e\u026b\3\2\2\2\u026e\u026c\3\2\2\2\u026e\u026d\3\2\2\2\u026fA"+
+    "\3\2\2\2\u0270\u027b\5D#\2\u0271\u0272\7e\2\2\u0272\u0273\5D#\2\u0273"+
+    "\u0274\7k\2\2\u0274\u027b\3\2\2\2\u0275\u027b\5F$\2\u0276\u0277\7e\2\2"+
+    "\u0277\u0278\5F$\2\u0278\u0279\7k\2\2\u0279\u027b\3\2\2\2\u027a\u0270"+
+    "\3\2\2\2\u027a\u0271\3\2\2\2\u027a\u0275\3\2\2\2\u027a\u0276\3\2\2\2\u027b"+
+    "C\3\2\2\2\u027c\u027d\7\21\2\2\u027d\u027e\7\3\2\2\u027e\u027f\5,\27\2"+
+    "\u027f\u0280\7\f\2\2\u0280\u0281\5\\/\2\u0281\u0282\7\4\2\2\u0282E\3\2"+
+    "\2\2\u0283\u0284\7\25\2\2\u0284\u0285\7\3\2\2\u0285\u0286\5,\27\2\u0286"+
+    "\u0287\7\5\2\2\u0287\u0288\5\\/\2\u0288\u0289\7\4\2\2\u0289G\3\2\2\2\u028a"+
+    "\u0290\5J&\2\u028b\u028c\7e\2\2\u028c\u028d\5J&\2\u028d\u028e\7k\2\2\u028e"+
+    "\u0290\3\2\2\2\u028f\u028a\3\2\2\2\u028f\u028b\3\2\2\2\u0290I\3\2\2\2"+
+    "\u0291\u0292\7%\2\2\u0292\u0293\7\3\2\2\u0293\u0294\5`\61\2\u0294\u0295"+
+    "\7)\2\2\u0295\u0296\5<\37\2\u0296\u0297\7\4\2\2\u0297K\3\2\2\2\u0298\u029e"+
+    "\5N(\2\u0299\u029a\7e\2\2\u029a\u029b\5N(\2\u029b\u029c\7k\2\2\u029c\u029e"+
+    "\3\2\2\2\u029d\u0298\3\2\2\2\u029d\u0299\3\2\2\2\u029eM\3\2\2\2\u029f"+
+    "\u02a0\5P)\2\u02a0\u02ac\7\3\2\2\u02a1\u02a3\5\36\20\2\u02a2\u02a1\3\2"+
+    "\2\2\u02a2\u02a3\3\2\2\2\u02a3\u02a4\3\2\2\2\u02a4\u02a9\5,\27\2\u02a5"+
+    "\u02a6\7\5\2\2\u02a6\u02a8\5,\27\2\u02a7\u02a5\3\2\2\2\u02a8\u02ab\3\2"+
+    "\2\2\u02a9\u02a7\3\2\2\2\u02a9\u02aa\3\2\2\2\u02aa\u02ad\3\2\2\2\u02ab"+
+    "\u02a9\3\2\2\2\u02ac\u02a2\3\2\2\2\u02ac\u02ad\3\2\2\2\u02ad\u02ae\3\2"+
+    "\2\2\u02ae\u02af\7\4\2\2\u02afO\3\2\2\2\u02b0\u02b4\7\67\2\2\u02b1\u02b4"+
+    "\7L\2\2\u02b2\u02b4\5`\61\2\u02b3\u02b0\3\2\2\2\u02b3\u02b1\3\2\2\2\u02b3"+
+    "\u02b2\3\2\2\2\u02b4Q\3\2\2\2\u02b5\u02d0\7B\2\2\u02b6\u02d0\5X-\2\u02b7"+
+    "\u02d0\5h\65\2\u02b8\u02d0\5V,\2\u02b9\u02bb\7|\2\2\u02ba\u02b9\3\2\2"+
+    "\2\u02bb\u02bc\3\2\2\2\u02bc\u02ba\3\2\2\2\u02bc\u02bd\3\2\2\2\u02bd\u02d0"+
+    "\3\2\2\2\u02be\u02d0\7{\2\2\u02bf\u02c0\7g\2\2\u02c0\u02c1\5j\66\2\u02c1"+
+    "\u02c2\7k\2\2\u02c2\u02d0\3\2\2\2\u02c3\u02c4\7h\2\2\u02c4\u02c5\5j\66"+
+    "\2\u02c5\u02c6\7k\2\2\u02c6\u02d0\3\2\2\2\u02c7\u02c8\7i\2\2\u02c8\u02c9"+
+    "\5j\66\2\u02c9\u02ca\7k\2\2\u02ca\u02d0\3\2\2\2\u02cb\u02cc\7j\2\2\u02cc"+
+    "\u02cd\5j\66\2\u02cd\u02ce\7k\2\2\u02ce\u02d0\3\2\2\2\u02cf\u02b5\3\2"+
+    "\2\2\u02cf\u02b6\3\2\2\2\u02cf\u02b7\3\2\2\2\u02cf\u02b8\3\2\2\2\u02cf"+
+    "\u02ba\3\2\2\2\u02cf\u02be\3\2\2\2\u02cf\u02bf\3\2\2\2\u02cf\u02c3\3\2"+
+    "\2\2\u02cf\u02c7\3\2\2\2\u02cf\u02cb\3\2\2\2\u02d0S\3\2\2\2\u02d1\u02d2"+
+    "\t\r\2\2\u02d2U\3\2\2\2\u02d3\u02d4\t\16\2\2\u02d4W\3\2\2\2\u02d5\u02d7"+
+    "\7\63\2\2\u02d6\u02d8\t\7\2\2\u02d7\u02d6\3\2\2\2\u02d7\u02d8\3\2\2\2"+
+    "\u02d8\u02db\3\2\2\2\u02d9\u02dc\5h\65\2\u02da\u02dc\5j\66\2\u02db\u02d9"+
+    "\3\2\2\2\u02db\u02da\3\2\2\2\u02dc\u02dd\3\2\2\2\u02dd\u02e0\5Z.\2\u02de"+
+    "\u02df\7Z\2\2\u02df\u02e1\5Z.\2\u02e0\u02de\3\2\2\2\u02e0\u02e1\3\2\2"+
+    "\2\u02e1Y\3\2\2\2\u02e2\u02e3\t\17\2\2\u02e3[\3\2\2\2\u02e4\u02e5\5`\61"+
+    "\2\u02e5]\3\2\2\2\u02e6\u02e7\5`\61\2\u02e7\u02e8\7z\2\2\u02e8\u02ea\3"+
+    "\2\2\2\u02e9\u02e6\3\2\2\2\u02ea\u02ed\3\2\2\2\u02eb\u02e9\3\2\2\2\u02eb"+
+    "\u02ec\3\2\2\2\u02ec\u02ee\3\2\2\2\u02ed\u02eb\3\2\2\2\u02ee\u02ef\5`"+
+    "\61\2\u02ef_\3\2\2\2\u02f0\u02f3\5d\63\2\u02f1\u02f3\5f\64\2\u02f2\u02f0"+
+    "\3\2\2\2\u02f2\u02f1\3\2\2\2\u02f3a\3\2\2\2\u02f4\u02f5\5`\61\2\u02f5"+
+    "\u02f6\7\6\2\2\u02f6\u02f8\3\2\2\2\u02f7\u02f4\3\2\2\2\u02f7\u02f8\3\2"+
+    "\2\2\u02f8\u02f9\3\2\2\2\u02f9\u0301\7\u0081\2\2\u02fa\u02fb\5`\61\2\u02fb"+
+    "\u02fc\7\6\2\2\u02fc\u02fe\3\2\2\2\u02fd\u02fa\3\2\2\2\u02fd\u02fe\3\2"+
+    "\2\2\u02fe\u02ff\3\2\2\2\u02ff\u0301\5`\61\2\u0300\u02f7\3\2\2\2\u0300"+
+    "\u02fd\3\2\2\2\u0301c\3\2\2\2\u0302\u0305\7\u0082\2\2\u0303\u0305\7\u0083"+
+    "\2\2\u0304\u0302\3\2\2\2\u0304\u0303\3\2\2\2\u0305e\3\2\2\2\u0306\u030a"+
+    "\7\177\2\2\u0307\u030a\5n8\2\u0308\u030a\7\u0080\2\2\u0309\u0306\3\2\2"+
+    "\2\u0309\u0307\3\2\2\2\u0309\u0308\3\2\2\2\u030ag\3\2\2\2\u030b\u030e"+
+    "\7~\2\2\u030c\u030e\7}\2\2\u030d\u030b\3\2\2\2\u030d\u030c\3\2\2\2\u030e"+
+    "i\3\2\2\2\u030f\u0310\t\20\2\2\u0310k\3\2\2\2\u0311\u0312\7_\2\2\u0312"+
+    "\u0313\5,\27\2\u0313\u0314\7X\2\2\u0314\u0315\5,\27\2\u0315m\3\2\2\2\u0316"+
+    "\u0317\t\21\2\2\u0317o\3\2\2\2k\177\u0081\u0085\u008e\u0090\u0094\u009b"+
+    "\u00a2\u00a7\u00ac\u00b4\u00b8\u00c0\u00c3\u00c9\u00ce\u00d1\u00d6\u00d9"+
+    "\u00db\u00e3\u00e6\u00f2\u00f5\u00f8\u00ff\u0106\u010a\u010e\u0112\u0119"+
+    "\u011d\u0121\u0126\u012a\u0132\u0136\u013d\u0148\u014b\u014f\u015b\u015e"+
+    "\u0164\u016b\u0172\u0175\u0179\u017d\u0181\u0183\u018e\u0193\u0197\u019a"+
+    "\u01a0\u01a3\u01a9\u01ac\u01ae\u01d1\u01d9\u01db\u01e2\u01e7\u01ea\u01f2"+
+    "\u01fb\u0201\u0209\u020e\u0214\u0217\u021e\u0226\u022c\u0238\u023a\u0245"+
+    "\u0254\u0259\u025d\u0261\u0268\u026e\u027a\u028f\u029d\u02a2\u02a9\u02ac"+
+    "\u02b3\u02bc\u02cf\u02d7\u02db\u02e0\u02eb\u02f2\u02f7\u02fd\u0300\u0304"+
+    "\u0309\u030d";
   public static final ATN _ATN =
     new ATNDeserializer().deserialize(_serializedATN.toCharArray());
   static {
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseVisitor.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseVisitor.java
index 56310aa66eb..7f44a1593c2 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseVisitor.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/SqlBaseVisitor.java
@@ -414,6 +414,13 @@ interface SqlBaseVisitor<T> extends ParseTreeVisitor<T> {
    * @return the visitor result
    */
   T visitSubqueryExpression(SqlBaseParser.SubqueryExpressionContext ctx);
+  /**
+   * Visit a parse tree produced by the {@code case}
+   * labeled alternative in {@link SqlBaseParser#primaryExpression}.
+   * @param ctx the parse tree
+   * @return the visitor result
+   */
+  T visitCase(SqlBaseParser.CaseContext ctx);
   /**
    * Visit a parse tree produced by {@link SqlBaseParser#builtinDateTimeFunction}.
    * @param ctx the parse tree
@@ -635,6 +642,12 @@ interface SqlBaseVisitor<T> extends ParseTreeVisitor<T> {
    * @return the visitor result
    */
   T visitString(SqlBaseParser.StringContext ctx);
+  /**
+   * Visit a parse tree produced by {@link SqlBaseParser#whenClause}.
+   * @param ctx the parse tree
+   * @return the visitor result
+   */
+  T visitWhenClause(SqlBaseParser.WhenClauseContext ctx);
   /**
    * Visit a parse tree produced by {@link SqlBaseParser#nonReserved}.
    * @param ctx the parse tree
diff --git a/x-pack/plugin/sql/src/main/resources/org/elasticsearch/xpack/sql/plugin/sql_whitelist.txt b/x-pack/plugin/sql/src/main/resources/org/elasticsearch/xpack/sql/plugin/sql_whitelist.txt
index 56b91138944..4ac4632572c 100644
--- a/x-pack/plugin/sql/src/main/resources/org/elasticsearch/xpack/sql/plugin/sql_whitelist.txt
+++ b/x-pack/plugin/sql/src/main/resources/org/elasticsearch/xpack/sql/plugin/sql_whitelist.txt
@@ -47,8 +47,9 @@ class org.elasticsearch.xpack.sql.expression.function.scalar.whitelist.InternalS
   Boolean isNotNull(Object)
 
 #
-# Null
+# Conditional
 #
+  def caseFunction(java.util.List)
   def coalesce(java.util.List)
   def greatest(java.util.List)
   def least(java.util.List)
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java
index c2310aa331e..24e993a2d83 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java
@@ -598,6 +598,26 @@ public class VerifierErrorMessagesTests extends ESTestCase {
             error("SELECT 1 = 1 OR " + arbirtraryArgsFunction + "(null, 3, '4') > 1"));
     }
 
+    public void testCaseWithNonBooleanConditionExpression() {
+        assertEquals("1:8: condition of [WHEN abs(int) THEN 'foo'] must be [boolean], found value [abs(int)] type [integer]",
+            error("SELECT CASE WHEN int = 1 THEN 'one' WHEN abs(int) THEN 'foo' END FROM test"));
+    }
+
+    public void testCaseWithDifferentResultDataTypes() {
+        assertEquals("1:8: result of [WHEN int > 10 THEN 10] must be [keyword], found value [10] type [integer]",
+            error("SELECT CASE WHEN int > 20 THEN 'foo' WHEN int > 10 THEN 10 ELSE 'bar' END FROM test"));
+    }
+
+    public void testCaseWithDifferentResultAndDefaultValueDataTypes() {
+        assertEquals("1:8: ELSE clause of [date] must be [keyword], found value [date] type [datetime]",
+            error("SELECT CASE WHEN int > 20 THEN 'foo' ELSE date END FROM test"));
+    }
+
+    public void testCaseWithDifferentResultAndDefaultValueDataTypesAndNullTypesSkipped() {
+        assertEquals("1:8: ELSE clause of [date] must be [keyword], found value [date] type [datetime]",
+            error("SELECT CASE WHEN int > 20 THEN null WHEN int > 10 THEN null WHEN int > 5 THEN 'foo' ELSE date END FROM test"));
+    }
+
     public void testAggsInWhere() {
         assertEquals("1:33: Cannot use WHERE filtering on aggregate function [MAX(int)], use HAVING instead",
                 error("SELECT MAX(int) FROM test WHERE MAX(int) > 10 GROUP BY bool"));
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseTests.java
new file mode 100644
index 00000000000..efc86bb47d2
--- /dev/null
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/expression/predicate/conditional/CaseTests.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.sql.expression.predicate.conditional;
+
+import org.elasticsearch.xpack.sql.expression.Expression;
+import org.elasticsearch.xpack.sql.expression.function.scalar.FunctionTestUtils;
+import org.elasticsearch.xpack.sql.expression.predicate.operator.comparison.Equals;
+import org.elasticsearch.xpack.sql.tree.AbstractNodeTestCase;
+import org.elasticsearch.xpack.sql.tree.NodeSubclassTests;
+import org.elasticsearch.xpack.sql.tree.Source;
+import org.elasticsearch.xpack.sql.tree.SourceTests;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+import static org.elasticsearch.xpack.sql.expression.function.scalar.FunctionTestUtils.randomIntLiteral;
+import static org.elasticsearch.xpack.sql.expression.function.scalar.FunctionTestUtils.randomStringLiteral;
+import static org.elasticsearch.xpack.sql.tree.SourceTests.randomSource;
+
+/**
+ * Needed to override tests in {@link NodeSubclassTests} as Case is special since its children are not usual
+ * expressions but {@link IfConditional}s.
+ */
+public class CaseTests extends AbstractNodeTestCase<Case, Expression> {
+
+    public static Case randomCase() {
+        int noConditionals = randomIntBetween(1, 5);
+        List<Expression> expressions = new ArrayList<>(noConditionals + 1);
+        for (int i = 0; i < noConditionals; i++) {
+            expressions.add(new IfConditional(
+                randomSource(), new Equals(randomSource(), randomStringLiteral(), randomStringLiteral()), randomIntLiteral()));
+
+        }
+        // default else
+        expressions.add(randomIntLiteral());
+        return new Case(randomSource(), expressions);
+    }
+
+    @Override
+    protected Case randomInstance() {
+        return randomCase();
+    }
+
+    @Override
+    protected Case mutate(Case instance) {
+        Case c = randomCase();
+        return new Case(c.source(), mutateChildren(c));
+    }
+
+    @Override
+    protected Case copy(Case instance) {
+        return new Case(instance.source(), instance.children());
+    }
+
+    @Override
+    public void testTransform() {
+        Case c = randomCase();
+
+        Source newSource = randomValueOtherThan(c.source(), SourceTests::randomSource);
+        assertEquals(new Case(c.source(), c.children()),
+            c.transformPropertiesOnly(p -> Objects.equals(p, c.source()) ? newSource: p, Object.class));
+
+        String newName = randomValueOtherThan(c.name(), () -> randomAlphaOfLength(5));
+        assertEquals(new Case(c.source(), c.children()),
+            c.transformPropertiesOnly(p -> Objects.equals(p, c.name()) ? newName : p, Object.class));
+    }
+
+    @Override
+    public void testReplaceChildren() {
+        Case c = randomCase();
+
+        List<Expression> newChildren = mutateChildren(c);
+        assertEquals(new Case(c.source(), newChildren), c.replaceChildren(newChildren));
+    }
+
+    private List<Expression> mutateChildren(Case c) {
+        boolean removeConditional = randomBoolean();
+        List<Expression> expressions = new ArrayList<>(c.children().size());
+        if (removeConditional) {
+            expressions.addAll(c.children().subList(0, c.children().size() - 2));
+        } else {
+            int rndIdx = randomInt(c.conditions().size());
+            for (int i = 0; i < c.conditions().size(); i++) {
+                if (i == rndIdx) {
+                    expressions.add(new IfConditional(randomValueOtherThan(c.conditions().get(i).source(), SourceTests::randomSource),
+                        new Equals(randomSource(), randomStringLiteral(), randomStringLiteral()),
+                        randomValueOtherThan(c.conditions().get(i).condition(), FunctionTestUtils::randomStringLiteral)));
+                } else {
+                    expressions.add(c.conditions().get(i));
+                }
+            }
+        }
+        expressions.add(c.defaultElse());
+        return expressions;
+    }
+}
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/optimizer/OptimizerTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/optimizer/OptimizerTests.java
index eb8ac2b4d15..f77088c3fdf 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/optimizer/OptimizerTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/optimizer/OptimizerTests.java
@@ -44,9 +44,11 @@ import org.elasticsearch.xpack.sql.expression.function.scalar.string.Repeat;
 import org.elasticsearch.xpack.sql.expression.predicate.BinaryOperator;
 import org.elasticsearch.xpack.sql.expression.predicate.Range;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.ArbitraryConditionalFunction;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.Case;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Coalesce;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.ConditionalFunction;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Greatest;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfConditional;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfNull;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Least;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.NullIf;
@@ -112,9 +114,12 @@ import static org.elasticsearch.xpack.sql.expression.Literal.FALSE;
 import static org.elasticsearch.xpack.sql.expression.Literal.NULL;
 import static org.elasticsearch.xpack.sql.expression.Literal.TRUE;
 import static org.elasticsearch.xpack.sql.expression.Literal.of;
+import static org.elasticsearch.xpack.sql.optimizer.Optimizer.SimplifyCase;
+import static org.elasticsearch.xpack.sql.optimizer.Optimizer.SortAggregateOnOrderBy;
 import static org.elasticsearch.xpack.sql.tree.Source.EMPTY;
 import static org.elasticsearch.xpack.sql.util.DateUtils.UTC;
 import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.startsWith;
 
 public class OptimizerTests extends ESTestCase {
 
@@ -595,6 +600,91 @@ public class OptimizerTests extends ESTestCase {
         assertEquals(StringUtils.EMPTY, foldNull.rule(new Concat(EMPTY, NULL, NULL)).fold());
     }
 
+    public void testSimplifyCaseConditionsFoldWhenFalse() {
+        // CASE WHEN a = 1 THEN 'foo1'
+        //      WHEN 1 = 2 THEN 'bar1'
+        //      WHEN 2 = 1 THEN 'bar2'
+        //      WHEN a > 1 THEN 'foo2'
+        // ELSE 'default'
+        // END
+        //
+        // ==>
+        //
+        // CASE WHEN a = 1 THEN 'foo1'
+        //      WHEN a > 1 THEN 'foo2'
+        // ELSE 'default'
+        // END
+
+        Case c = new Case(EMPTY, Arrays.asList(
+            new IfConditional(EMPTY, new Equals(EMPTY, getFieldAttribute(), ONE), Literal.of(EMPTY, "foo1")),
+            new IfConditional(EMPTY, new Equals(EMPTY, ONE, TWO), Literal.of(EMPTY, "bar1")),
+            new IfConditional(EMPTY, new Equals(EMPTY, TWO, ONE), Literal.of(EMPTY, "bar2")),
+            new IfConditional(EMPTY, new GreaterThan(EMPTY, getFieldAttribute(), ONE), Literal.of(EMPTY, "foo2")),
+            Literal.of(EMPTY, "default")));
+        Expression e = new SimplifyCase().rule(c);
+        assertEquals(Case.class, e.getClass());
+        c = (Case) e;
+        assertEquals(2, c.conditions().size());
+        assertThat(c.conditions().get(0).condition().toString(), startsWith("Equals[a{f}#"));
+        assertThat(c.conditions().get(1).condition().toString(), startsWith("GreaterThan[a{f}#"));
+        assertFalse(c.foldable());
+    }
+
+    public void testSimplifyCaseConditionsFoldWhenTrue() {
+        // CASE WHEN a = 1 THEN 'foo1'
+        //      WHEN 1 = 1 THEN 'bar1'
+        //      WHEN 2 = 1 THEN 'bar2'
+        //      WHEN a > 1 THEN 'foo2'
+        // ELSE 'default'
+        // END
+        //
+        // ==>
+        //
+        // CASE WHEN a = 1 THEN 'foo1'
+        //      WHEN 1 = 1 THEN 'bar1'
+        // ELSE 'default'
+        // END
+
+        SimplifyCase rule = new SimplifyCase();
+        Case c = new Case(EMPTY, Arrays.asList(
+            new IfConditional(EMPTY, new Equals(EMPTY, getFieldAttribute(), ONE), Literal.of(EMPTY, "foo1")),
+            new IfConditional(EMPTY, new Equals(EMPTY, ONE, ONE), Literal.of(EMPTY, "bar1")),
+            new IfConditional(EMPTY, new Equals(EMPTY, TWO, ONE), Literal.of(EMPTY, "bar2")),
+            new IfConditional(EMPTY, new GreaterThan(EMPTY, getFieldAttribute(), ONE), Literal.of(EMPTY, "foo2")),
+            Literal.of(EMPTY, "default")));
+        Expression e = rule.rule(c);
+        assertEquals(Case.class, e.getClass());
+        c = (Case) e;
+        assertEquals(2, c.conditions().size());
+        assertThat(c.conditions().get(0).condition().toString(), startsWith("Equals[a{f}#"));
+        assertThat(c.conditions().get(1).condition().toString(), startsWith("Equals[=1,=1]#"));
+        assertFalse(c.foldable());
+    }
+
+    public void testSimplifyCaseConditionsFoldCompletely() {
+        // CASE WHEN 1 = 2 THEN 'foo1'
+        //      WHEN 1 = 1 THEN 'foo2'
+        // ELSE 'default'
+        // END
+        //
+        // ==>
+        //
+        // 'foo2'
+
+        SimplifyCase rule = new SimplifyCase();
+        Case c = new Case(EMPTY, Arrays.asList(
+            new IfConditional(EMPTY, new Equals(EMPTY, ONE, TWO), Literal.of(EMPTY, "foo1")),
+            new IfConditional(EMPTY, new Equals(EMPTY, ONE, ONE), Literal.of(EMPTY, "foo2")),
+            Literal.of(EMPTY, "default")));
+        Expression e = rule.rule(c);
+        assertEquals(Case.class, e.getClass());
+        c = (Case) e;
+        assertEquals(1, c.conditions().size());
+        assertThat(c.conditions().get(0).condition().toString(), startsWith("Equals[=1,=1]#"));
+        assertTrue(c.foldable());
+        assertEquals("foo2", c.fold());
+    }
+
     //
     // Logical simplifications
     //
@@ -1318,7 +1408,7 @@ public class OptimizerTests extends ESTestCase {
         OrderBy orderByPlan = new OrderBy(EMPTY,
                 new Aggregate(EMPTY, FROM(), Arrays.asList(secondField, firstField), Arrays.asList(secondAlias, firstAlias)),
                 Arrays.asList(firstOrderBy, secondOrderBy));
-        LogicalPlan result = new Optimizer.SortAggregateOnOrderBy().apply(orderByPlan);
+        LogicalPlan result = new SortAggregateOnOrderBy().apply(orderByPlan);
         
         assertTrue(result instanceof OrderBy);
         List<Order> order = ((OrderBy) result).order();
@@ -1350,7 +1440,7 @@ public class OptimizerTests extends ESTestCase {
         OrderBy orderByPlan = new OrderBy(EMPTY,
                 new Aggregate(EMPTY, FROM(), Arrays.asList(secondAlias, firstAlias), Arrays.asList(secondAlias, firstAlias)),
                 Arrays.asList(firstOrderBy, secondOrderBy));
-        LogicalPlan result = new Optimizer.SortAggregateOnOrderBy().apply(orderByPlan);
+        LogicalPlan result = new SortAggregateOnOrderBy().apply(orderByPlan);
         
         assertTrue(result instanceof OrderBy);
         List<Order> order = ((OrderBy) result).order();
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/ExpressionTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/ExpressionTests.java
index 98d7922d218..a8e5df8e07c 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/ExpressionTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/ExpressionTests.java
@@ -11,6 +11,8 @@ import org.elasticsearch.xpack.sql.expression.Literal;
 import org.elasticsearch.xpack.sql.expression.function.UnresolvedFunction;
 import org.elasticsearch.xpack.sql.expression.function.scalar.Cast;
 import org.elasticsearch.xpack.sql.expression.literal.Interval;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.Case;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfConditional;
 import org.elasticsearch.xpack.sql.expression.predicate.operator.arithmetic.Add;
 import org.elasticsearch.xpack.sql.expression.predicate.operator.arithmetic.Mul;
 import org.elasticsearch.xpack.sql.expression.predicate.operator.arithmetic.Neg;
@@ -26,6 +28,7 @@ import java.time.temporal.TemporalAmount;
 import java.util.Locale;
 
 import static java.lang.String.format;
+import static org.hamcrest.Matchers.startsWith;
 
 public class ExpressionTests extends ESTestCase {
 
@@ -447,4 +450,63 @@ public class ExpressionTests extends ESTestCase {
         Expression expr = parser.createExpression(s);
         assertEquals(s, expr.sourceText());
     }
+
+    public void testCaseWithoutOperand() {
+        Expression expr = parser.createExpression(
+            "CASE WHEN a = 1 THEN 'one'" +
+            "     WHEN a > 2 THEN 'a few'" +
+            "     WHEN a > 10 THEN 'many' " +
+            "END");
+
+        assertEquals(Case.class, expr.getClass());
+        Case c = (Case) expr;
+        assertEquals(3, c.conditions().size());
+        IfConditional ifc = c.conditions().get(0);
+        assertEquals("WHEN a = 1 THEN 'one'", ifc.sourceText());
+        assertThat(ifc.condition().toString(), startsWith("Equals[?a,1]#"));
+        assertEquals("'one'=one", ifc.result().toString());
+        assertEquals(Literal.NULL, c.defaultElse());
+
+        expr = parser.createExpression(
+            "CASE WHEN a = 1 THEN 'one'" +
+            "     WHEN a <= 2 THEN 'a few'" +
+            "ELSE 'many' " +
+            "END");
+
+        assertEquals(Case.class, expr.getClass());
+        c = (Case) expr;
+        assertEquals(2, c.conditions().size());
+        ifc = c.conditions().get(0);
+        assertEquals("WHEN a = 1 THEN 'one'", ifc.sourceText());
+        assertEquals("'many'=many", c.defaultElse().toString());
+    }
+
+    public void testCaseWithOperand() {
+        Expression expr = parser.createExpression(
+            "CASE a WHEN 1 THEN 'one'" +
+            "       WHEN 2 THEN 'two'" +
+            "       WHEN 3 THEN 'three' " +
+            "END");
+
+        assertEquals(Case.class, expr.getClass());
+        Case c = (Case) expr;
+        assertEquals(3, c.conditions().size());
+        IfConditional ifc = c.conditions().get(0);
+        assertEquals("WHEN 1 THEN 'one'", ifc.sourceText());
+        assertThat(ifc.condition().toString(), startsWith("Equals[?a,1]#"));
+        assertEquals("'one'=one", ifc.result().toString());
+        assertEquals(Literal.NULL, c.defaultElse());
+
+        expr = parser.createExpression(
+            "CASE a WHEN 1 THEN 'one'" +
+            "       WHEN 2 THEN 'two'" +
+            "ELSE 'many' " +
+            "END");
+        assertEquals(Case.class, expr.getClass());
+        c = (Case) expr;
+        assertEquals(2, c.conditions().size());
+        ifc = c.conditions().get(0);
+        assertEquals("WHEN 1 THEN 'one'", ifc.sourceText());
+        assertEquals("'many'=many", c.defaultElse().toString());
+    }
 }
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryTranslatorTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryTranslatorTests.java
index 85bc20596e9..ca3c3a92ce6 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryTranslatorTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryTranslatorTests.java
@@ -587,6 +587,21 @@ public class QueryTranslatorTests extends ESTestCase {
         assertEquals("[{v=int}, {v=10}]", scriptTemplate.params().toString());
     }
 
+    public void testTranslateCase_GroupBy_Painless() {
+        LogicalPlan p = plan("SELECT CASE WHEN int > 10 THEN 'foo' WHEN int > 20 THEN 'bar' ELSE 'default' END FROM test GROUP BY 1");
+        assertTrue(p instanceof Aggregate);
+        Expression condition = ((Aggregate) p).groupings().get(0);
+        assertFalse(condition.foldable());
+        QueryTranslator.GroupingContext groupingContext = QueryTranslator.groupBy(((Aggregate) p).groupings());
+        assertNotNull(groupingContext);
+        ScriptTemplate scriptTemplate = groupingContext.tail.script();
+        assertEquals("InternalSqlScriptUtils.caseFunction([InternalSqlScriptUtils.gt(InternalSqlScriptUtils.docValue(" + "" +
+                "doc,params.v0),params.v1),params.v2,InternalSqlScriptUtils.gt(InternalSqlScriptUtils.docValue(doc,params.v3)," +
+                "params.v4),params.v5,params.v6])",
+            scriptTemplate.toString());
+        assertEquals("[{v=int}, {v=10}, {v=foo}, {v=int}, {v=20}, {v=bar}, {v=default}]", scriptTemplate.params().toString());
+    }
+
     public void testGroupByDateHistogram() {
         LogicalPlan p = plan("SELECT MAX(int) FROM test GROUP BY HISTOGRAM(int, 1000)");
         assertTrue(p instanceof Aggregate);
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/tree/NodeSubclassTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/tree/NodeSubclassTests.java
index f11519f0f97..cad06da0a82 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/tree/NodeSubclassTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/tree/NodeSubclassTests.java
@@ -6,7 +6,6 @@
 package org.elasticsearch.xpack.sql.tree;
 
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
-
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.io.PathUtils;
 import org.elasticsearch.test.ESTestCase;
@@ -29,6 +28,7 @@ import org.elasticsearch.xpack.sql.expression.gen.pipeline.BinaryPipesTests;
 import org.elasticsearch.xpack.sql.expression.gen.pipeline.Pipe;
 import org.elasticsearch.xpack.sql.expression.gen.processor.ConstantProcessor;
 import org.elasticsearch.xpack.sql.expression.gen.processor.Processor;
+import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfConditional;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfNull;
 import org.elasticsearch.xpack.sql.expression.predicate.fulltext.FullTextPredicate;
 import org.elasticsearch.xpack.sql.expression.predicate.operator.comparison.In;
@@ -92,8 +92,8 @@ import static org.mockito.Mockito.mock;
  */
 public class NodeSubclassTests<T extends B, B extends Node<B>> extends ESTestCase {
 
-    private static final List<Class<?>> CLASSES_WITH_MIN_TWO_CHILDREN = Arrays.asList(IfNull.class, In.class, InPipe.class,
-            Percentile.class, Percentiles.class, PercentileRanks.class);
+    private static final List<Class<?>> CLASSES_WITH_MIN_TWO_CHILDREN = Arrays.asList(IfConditional.class, IfNull.class,
+        In.class, InPipe.class, Percentile.class, Percentiles.class, PercentileRanks.class);
 
     private final Class<T> subclass;