Re: Add RESPECT/IGNORE NULLS and FROM FIRST/LAST options

Tatsuo Ishii <ishii@postgresql.org>

From: Tatsuo Ishii <ishii@postgresql.org>

To: ojford@gmail.com

Cc: tgl@sss.pgh.pa.us, ishii@postgresql.org, vik@postgresfriends.org, pgsql-hackers@postgresql.org, andrew@tao11.riddles.org.uk, david@fetter.org, krasiyan@gmail.com

Date: 2025-01-21T01:20:53Z

Lists: pgsql-hackers

Commits

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Fix coding style with "else".
- 20628b62e46e 19 (unreleased) landed
Fix multi WinGetFuncArgInFrame/Partition calls with IGNORE NULLS.
- 2d7b247cb414 19 (unreleased) landed
Fix Coverity issue reported in commit 2273fa32bce.
- dd766a441d69 19 (unreleased) landed
Use ereport rather than elog in WinCheckAndInitializeNullTreatment.
- 5f3808646f67 19 (unreleased) landed
Avoid uninitialized-variable warnings from older compilers.
- 71540dcdcb22 19 (unreleased) cited
Fix Coverity issues reported in commit 25a30bbd423.
- 2273fa32bce7 19 (unreleased) landed
Improve EXPLAIN's display of window functions.
- 8b1b342544b6 18.0 cited
Automatically generate node support functions
- 964d01ae90c3 16.0 cited

>> No, there needs to be a way for the individual window function to
>> throw error if that's specified for a function that can't handle it.
>> I'm just saying I don't want that to be hard-wired in some centralized
>> spot.
> 
> Would it be acceptable to add a bool column to pg_proc, say
> "pronulltreatment"? It would default to false, and an error would be
> thrown if the null clause is specified for a function where it's set
> to false?

It needs lots of work including modifying CREATE FUNCTION
command. Instead you could add an API to WinObject access functions to
export ignore_nulls value. Then let each window function check it. If
the window function should not take IGNORE/RESPECT NULLS option, throw
an error.

Best reagards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp