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Fix like_fixed_prefix_ci() selectivity.

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A wrong calculation introduced by 9c8de15969 could cause trailing
characters from the prefix to be passed to like_selectivity() rather
than just the "rest".

Discussion: https://postgr.es/m/c7334a7a44243d2e4ec5e83747589908b3787491.camel@j-davis.com
Backpatch-through: 19
This commit is contained in:
Jeff Davis
2026-07-15 12:34:20 -07:00
parent 95c1b8ec77
commit 94e1b104f8
1 changed files with 2 additions and 2 deletions
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4
src/backend/utils/adt/like_support.c
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@@ -1150,12 +1150,12 @@ like_fixed_prefix_ci(Const *patt_const, Oid collation, Const **prefix_const,
if (rest_selec != NULL)
{
int wrestlen = wpattlen - wmatch_pos;
int wrestlen = wpattlen - wpos;
char *rest;
int rest_mblen;
rest = palloc(pg_database_encoding_max_length() * wrestlen + 1);
rest_mblen = pg_wchar2mb_with_len(&wpatt[wmatch_pos], rest, wrestlen);
rest_mblen = pg_wchar2mb_with_len(&wpatt[wpos], rest, wrestlen);
*rest_selec = like_selectivity(rest, rest_mblen, true);
pfree(rest);