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Fix broken hash function hashbpcharextended().

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Ignore trailing spaces for non-deterministic collations when
hashing.

The previous behavior could lead to tuples falling into the wrong
partitions when hash partitioning is combined with the BPCHAR type and
a non-deterministic collation. Fortunately, it did not affect hash
indexes, because hash indexes do not use extended hash functions.

Decline to backpatch, per discussion.

Discussion: https://postgr.es/m/eb83d0ac7b299eb08f9b900dd08a5a0c5d90e517.camel@j-davis.com
Reviewed-by: Richard Guo, Tom Lane
This commit is contained in:
Jeff Davis 2022-12-01 11:08:47 -08:00
parent 4c689a69ee
commit 7ac0f8d384
1 changed files with 1 additions and 1 deletions
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src/backend/utils/adt/varchar.c
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@ -1086,7 +1086,7 @@ hashbpcharextended(PG_FUNCTION_ARGS)
Size bsize;
uint8_t *buf;
ulen = icu_to_uchar(&uchar, VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key));
ulen = icu_to_uchar(&uchar, keydata, keylen);
bsize = ucol_getSortKey(mylocale->info.icu.ucol,
uchar, ulen, NULL, 0);