Commit Graph

25 Commits

Author SHA1 Message Date
Marios Trivyzas f707fa9e0a
SQL: Introduce SQL DATE data type (#37693)
* SQL: Introduce SQL DATE data type

Support ANSI SQL's DATE type by introducing a runtime-only
ES SQL date type.

Closes: #37340
2019-01-24 13:41:58 +02:00
Marios Trivyzas 1686c32ba9
SQL: Rename SQL type DATE to DATETIME (#37395)
* SQL: Rename SQL data type DATE to DATETIME

SQL data type DATE has only the date part (e.g.: 2019-01-14)
without any time information. Previously the SQL type DATE was
referring to the ES DATE which contains also the time part along
with TZ information. To conform with SQL data types the data type
`DATE` is renamed to `DATETIME`, since it includes also the time,
as a new runtime SQL `DATE` data type will be introduced down the road,
which only contains the date part and meets the SQL standard.

Closes: #36440

* Address comments
2019-01-17 10:17:58 +02:00
Andrei Stefan 4a92de214a
SQL: Proper handling of COUNT(field_name) and COUNT(DISTINCT field_name) (#37254)
* provide overriden `hashCode` and toString methods to account for `DISTINCT`
* change the analyzer for scenarios where `COUNT <field_name>` and `COUNT DISTINCT` have different paths
* defined a new `filter` aggregation encapsulating an `exists` query to filter out null or missing values
2019-01-10 09:51:51 +02:00
Marios Trivyzas 33137907cf
SQL: Enhance message for PERCENTILE[_RANK] with field as 2nd arg (#36933)
Enhance error message for the case that the 2nd argument of PERCENTILE
and PERCENTILE_RANK is not a foldable, as it doesn't make sense to have
a dynamic value coming from a field.

Fixes: #36903
2019-01-03 13:55:09 +02:00
Andrei Stefan 09fa827adc
SQL: documentation improvements and updates (#36918)
* Added Limitations page
* Made the aggregations page follow the common template for functions
* Modified all tables to have the first row's cells content centered
* Polishing in other various sections
2018-12-21 23:25:54 +02:00
Costin Leau ac032a0b9d
SQL: Fix bug regarding histograms usage in scripting (#36866)
Allow scripts to correctly reference grouping functions
Fix bug in translation of date/time functions mixed with histograms.
Enhance Verifier to prevent histograms being nested inside other
 functions inside GROUP BY (as it implies double grouping)
Extend Histogram docs
2018-12-20 23:11:56 +02:00
Costin Leau 6ee6bb55e2
SQL: Introduce HISTOGRAM grouping function (#36510)
Introduce Histogram grouping function for bucketing/grouping data based
 on a given range. Both date and numeric histograms are supported using
 the appropriate range declaration (numbers vs intervals).

SELECT HISTOGRAM(number, 50) AS h FROM index GROUP BY h
SELECT HISTOGRAM(date, INTERVAL 1 YEAR) AS h FROM index GROUP BY h

In addition add multiply operator for Intervals
Add docs for intervals and histogram

Fix #36509
2018-12-14 18:20:37 +02:00
Costin Leau f502ca53d4
SQL: Introduce NOW/CURRENT_TIMESTAMP function (#36562)
Add CURRENT_TIMESTAMP as keyword as well function alongside NOW() 
 These return the current date/time for the  given query, computed when
 the statement reaches the server. For completeness, CURRENT_TIMESTAMP
 also accepts precision as an optional parameter.

Fix #36534
2018-12-14 15:42:36 +02:00
Andrei Stefan de373060fb
SQL: non ISO 8601 versions of DAY_OF_WEEK and WEEK_OF_YEAR functions (#36358)
* Renamed DAY_OF_WEEK and WEEK_OF_YEAR functions to their ISO version and
added the same functions with different functionality.
* Rewritten the datetime functions documentation to follow the format of the other
functions documentation pages.
2018-12-12 02:29:02 +02:00
Marios Trivyzas 031d0566b0
SQL: [docs] Add `beta[]` markup to all SQL pages (#36471)
Closes: #36437
2018-12-11 13:25:29 +02:00
Andrei Stefan aabff7318e
SQL: DATABASE() and USER() system functions (#35946) 2018-11-28 15:20:04 +02:00
Marios Trivyzas 3f7cae3f0d
SQL: Implement GREATEST and LEAST functions (#35879)
Add GREATEST(expr1, expr2, ... exprN) and LEAST(expr1, expr2, exprN)
functions which are in the family of CONDITIONAL functions.

Implementation follows PostgreSQL behaviour, so the functions return
`NULL` when all of their arguments evaluate to `NULL`.

Renamed `CoalescePipe` and `CoalesceProcessor` to `ConditionalPipe` and
`ConditionalProcessor` respectively, to be able to reuse them for
`Greatest` and `Least` evaluations. To achieve that `ConditionalOperation`
has been added to differentiate between the functionalities at execution
time.

Closes: #35878
2018-11-26 18:21:36 +01:00
Marios Trivyzas b078e2970c
SQL: Implement null safe equality operator `<=>` (#35873)
This operator handles nulls in different way than the normal `=`.
If one of the operants is `null` and the other not it returns `false`.
If both operants are `null` it returns `true`. Therefore in contrary to
`=`, which returns `null` if at least one of the operants is `null`, this one
never returns `null` as a result.

Closes: #35871
2018-11-26 14:02:02 +01:00
Marios Trivyzas 410f570d5f
SQL: Implement NULLIF(expr1, expr2) function (#35826)
NULLIF returns null if the 2 expressions are equal or the
expr1 otherwise.

Closes: #35818
2018-11-23 22:19:27 +01:00
Marios Trivyzas 92acf47c16
SQL: Implement NVL(expr1, expr2) (#35794)
Add NVL as alias to IFNULL as they have the same
behaviour. Add basic tests and docs.

Closes: #35782
2018-11-22 11:41:00 +01:00
Marios Trivyzas d95d885bae
SQL: Implement ISNULL(expr1, expr2) (#35793)
Add ISNULL as an alias of IFNULL as they have the
same behaviour. Add basic test and docs.

Closes: #35781
2018-11-21 23:15:10 +01:00
Marios Trivyzas e179bd393d
SQL: Implement IFNULL variant of COALESCE (#35762)
IFNULL is a MySQL variant (also used in other DBs) which
takes only 2 arguments and returns the first one that is not null.

Closes: #35749
2018-11-21 17:07:07 +01:00
Marios Trivyzas b1818dbdce
SQL: [docs] Add documentation for COALESCE (#35740)
Follows: #35253
2018-11-21 01:43:05 +01:00
Marios Trivyzas 4a8386f271
SQL: Implement IN(value1, value2, ...) expression. (#34581)
Implement the functionality to translate the
`field IN (value1, value2,...)` expressions to proper Lucene queries
or painless script or local processors depending on the use case.

The `IN` expression can be used in SELECT, WHERE and HAVING clauses.

Closes: #32955
2018-10-23 14:28:23 +02:00
Marios Trivyzas e9e140790a
SQL: Implement `CONVERT`, an alternative to `CAST` (#34660)
`CONVERT` works exactly like cast with slightly different syntax:
`CONVERT(<value>, <data_type)` as opposed to `CAST(<value> AS <data_type>)`

Moreover it support format of the MS-SQL data types `SQL_<type>`,
e.g.: `SQL_INTEGER`

Closes: #34513
2018-10-23 11:21:15 +02:00
Andrei Stefan d7a94fb6aa
SQL: Functions enhancements (OCTET_LENGTH function, order functions alphabetically, RANDOM function docs) (#34101)
* New OCTET_LENGTH function
* Changed the way the FunctionRegistry stores functions, considering the alphabetic ordering by name
* Added documentation for the RANDOM function
2018-10-09 00:20:18 +03:00
Andrei Stefan 0fae6d39f5
SQL: functions docs update (#34000)
* Changed the format of the String functions documentation page.
* Adopted the same format for Math functions, but completely changed the examples.
* Added missing documentation for Math functions.
2018-09-25 02:42:18 +03:00
Andrei Stefan 6fb7e49b22
SQL: TRUNCATE and ROUND functions (#33779)
* Added TRUNCATE function, modified ROUND to accept two parameters instead of one. Made the second parameter optional for both functions.
* Added documentation for both functions.
2018-09-20 15:29:53 +03:00
Costin Leau 443f9caddd DOC: Enhance SQL Functions documentation
Split function section into multiple chapters
Add String functions
Add (small) section on Conversion/Cast functions
Add missing aggregation functions
Enable documentation testing (was disabled by accident). While at it,
fix failing tests
Improve spec tests to allow multi-line queries (useful for docs)
Add ability to ignore a spec test (name should end with -Ignore)
2018-09-06 18:09:53 +03:00
Lisa Cawley 638b9fd88c
[DOCS] Move sql to docs (#31474) 2018-06-22 15:40:25 -07:00