Costin Leau 17c7f99343
SQL: Show/desc commands now support table ids ()
Extend SHOW TABLES, DESCRIBE and SHOW COLUMNS to support table
identifiers not just SQL LIKE pattern.
This allows both Elasticsearch-style multi-index patterns and SQL LIKE.
To disambiguate between the two (as the " vs ' can be easy to miss),
the grammar now requires LIKE keyword as a prefix for all LIKE-like
patterns.

Also added some docs comparing the two types of patterns.

Fix 
2018-09-04 16:54:10 +03:00

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[role="xpack"]
[testenv="basic"]
[[sql-syntax-show-functions]]
=== SHOW FUNCTIONS
.Synopsis
[source, sql]
----
SHOW FUNCTIONS [ LIKE pattern<1>? ]?
----
<1> SQL match pattern
.Description
List all the SQL functions and their type. The `LIKE` clause can be used to restrict the list of names to the given pattern.
["source","sql",subs="attributes,callouts,macros"]
----
include-tagged::{sql-specs}/docs.csv-spec[showFunctions]
----
The list of functions returned can be customized based on the pattern.
It can be an exact match:
["source","sql",subs="attributes,callouts,macros"]
----
include-tagged::{sql-specs}/docs.csv-spec[showFunctionsLikeExact]
----
A wildcard for exactly one character:
["source","sql",subs="attributes,callouts,macros"]
----
include-tagged::{sql-specs}/docs.csv-spec[showFunctionsLikeChar]
----
A wildcard matching zero or more characters:
["source","sql",subs="attributes,callouts,macros"]
----
include-tagged::{sql-specs}/docs.csv-spec[showFunctionsLikeWildcard]
----
Or of course, a variation of the above:
["source","sql",subs="attributes,callouts,macros"]
----
include-tagged::{sql-specs}/docs.csv-spec[showFunctionsWithPattern]
----