mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-02-23 19:39:53 +08:00
Code Issues Packages Projects Releases Wiki Activity

C comment: mention no doc for negative start of substring(text)

Browse Source 
Also add URL to hackers discussion.

Backpatch-through: master
This commit is contained in:
Bruce Momjian 2024-03-26 12:27:41 -04:00
parent 8a92b70c11
commit e648e77e25
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/backend/utils/adt/varlena.c
View File

@ -891,8 +891,9 @@ text_substring(Datum str, int32 start, int32 length, bool length_not_specified)
int32 E; /* end position */
/*
* SQL99 says S can be zero or negative, but we still must fetch from the
* start of the string.
* SQL99 says S can be zero or negative (which we don't document), but we
* still must fetch from the start of the string.
* https://www.postgresql.org/message-id/170905442373.643.11536838320909376197%40wrigleys.postgresql.org
*/
S1 = Max(S, 1);