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9 Commits

Author SHA1 Message Date
Costin Leau 5b112b1d9d SQL: remove beta marker from documentation (#38661) 
(cherry picked from commit fb6e7a30c9eed1e8b83496aaf1efe7e2288f9dd8)
 2019-02-10 00:09:58 +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
Marios Trivyzas 031d0566b0
SQL: [docs] Add `beta[]` markup to all SQL pages (#36471) 
Closes: #36437
 2018-12-11 13:25:29 +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 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