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Fix regex, LIKE, and some other second-rank text-manipulation functions

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to not cause needless copying of text datums that have 1-byte headers.
Greg Stark, in response to performance gripe from Guillaume Smet and
ITAGAKI Takahiro.
This commit is contained in:
Tom Lane
2007-09-21 22:52:52 +00:00
parent cc59049daf
commit 7583f9a7ca
6 changed files with 212 additions and 192 deletions
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14
src/backend/access/hash/hashfunc.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashfunc.c,v 1.52 2007/06/01 15:33:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashfunc.c,v 1.53 2007/09/21 22:52:52 tgl Exp $
*
* NOTES
* These functions are stored in pg_amproc. For each operator class
@@ -157,7 +157,7 @@ hashname(PG_FUNCTION_ARGS)
Datum
hashtext(PG_FUNCTION_ARGS)
{
text *key = PG_GETARG_TEXT_P(0);
text *key = PG_GETARG_TEXT_PP(0);
Datum result;
/*
@@ -165,8 +165,8 @@ hashtext(PG_FUNCTION_ARGS)
* it as a separate function in case we someday want to do something
* different in non-C locales. (See also hashbpchar, if so.)
*/
result = hash_any((unsigned char *) VARDATA(key),
VARSIZE(key) - VARHDRSZ);
result = hash_any((unsigned char *) VARDATA_ANY(key),
VARSIZE_ANY_EXHDR(key));
/* Avoid leaking memory for toasted inputs */
PG_FREE_IF_COPY(key, 0);
@@ -181,11 +181,11 @@ hashtext(PG_FUNCTION_ARGS)
Datum
hashvarlena(PG_FUNCTION_ARGS)
{
struct varlena *key = PG_GETARG_VARLENA_P(0);
struct varlena *key = PG_GETARG_VARLENA_PP(0);
Datum result;
result = hash_any((unsigned char *) VARDATA(key),
VARSIZE(key) - VARHDRSZ);
result = hash_any((unsigned char *) VARDATA_ANY(key),
VARSIZE_ANY_EXHDR(key));
/* Avoid leaking memory for toasted inputs */
PG_FREE_IF_COPY(key, 0);