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Repair brain fade in commit b181a91981.

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The split between which things need to happen in the C-locale case and
which needed to happen in the locale-aware case was a few bricks short
of a load.  Try to fix that.
This commit is contained in:
Robert Haas 2015-01-22 12:47:46 -05:00
parent 59367fdf97
commit d060e07fa9
1 changed files with 15 additions and 12 deletions
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27
src/backend/utils/adt/varlena.c
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@ -1998,12 +1998,12 @@ bttext_abbrev_convert(Datum original, SortSupport ssup)
{
TextSortSupport *tss = (TextSortSupport *) ssup->ssup_extra;
text *authoritative = DatumGetTextPP(original);
char *authoritative_data = VARDATA_ANY(authoritative);
/* working state */
Datum res;
char *pres;
int len;
Size bsize;
uint32 hash;
/*
@ -2017,14 +2017,16 @@ bttext_abbrev_convert(Datum original, SortSupport ssup)
/*
* If we're using the C collation, use memcmp(), rather than strxfrm(),
* to abbreviated keys. The full comparator for the C locale is always
* to abbreviate keys. The full comparator for the C locale is always
* memcmp(), and we can't risk having this give a different answer.
* Besides, this should be faster, too.
*/
if (tss->collate_c)
memcpy(pres, VARDATA_ANY(authoritative), Min(len, sizeof(Datum)));
memcpy(pres, authoritative_data, Min(len, sizeof(Datum)));
else
{
Size bsize;
/*
* We're not using the C collation, so fall back on strxfrm.
*/
@ -2067,6 +2069,14 @@ bttext_abbrev_convert(Datum original, SortSupport ssup)
Min(tss->buflen2 * 2, MaxAllocSize));
tss->buf2 = palloc(tss->buflen2);
}
/*
* Every Datum byte is always compared. This is safe because the
* strxfrm() blob is itself NUL terminated, leaving no danger of
* misinterpreting any NUL bytes not intended to be interpreted as
* logically representing termination.
*/
memcpy(pres, tss->buf2, Min(sizeof(Datum), bsize));
}
/*
@ -2080,15 +2090,14 @@ bttext_abbrev_convert(Datum original, SortSupport ssup)
* in order to compensate for cases where differences are past
* CACHE_LINE_SIZE bytes, so as to limit the overhead of hashing.
*/
hash = hash_any((unsigned char *) tss->buf1, Min(len, PG_CACHE_LINE_SIZE));
hash = hash_any((unsigned char *) authoritative_data,
Min(len, PG_CACHE_LINE_SIZE));
if (len > PG_CACHE_LINE_SIZE)
hash ^= DatumGetUInt32(hash_uint32((uint32) len));
addHyperLogLog(&tss->full_card, hash);
memcpy(pres, tss->buf2, Min(sizeof(Datum), bsize));
/* Hash abbreviated key */
#if SIZEOF_DATUM == 8
{
@ -2105,12 +2114,6 @@ bttext_abbrev_convert(Datum original, SortSupport ssup)
addHyperLogLog(&tss->abbr_card, hash);
/*
* Every Datum byte is always compared. This is safe because the strxfrm()
* blob is itself NUL terminated, leaving no danger of misinterpreting any
* NUL bytes not intended to be interpreted as logically representing
* termination.
*/
return res;
}