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Add caching of query to GIN/GiST consistent function.

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Per performance gripe from nomao.com
This commit is contained in:
Teodor Sigaev
2008-07-11 11:56:48 +00:00
parent e3afbb3504
commit 2d6599f471
2 changed files with 48 additions and 6 deletions
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22
contrib/pg_trgm/trgm_gist.c
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@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/contrib/pg_trgm/trgm_gist.c,v 1.14 2008/05/17 01:28:21 adunstan Exp $
* $PostgreSQL: pgsql/contrib/pg_trgm/trgm_gist.c,v 1.15 2008/07/11 11:56:48 teodor Exp $
*/
#include "trgm.h"
@ -168,12 +168,30 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
/* Oid subtype = PG_GETARG_OID(3); */
bool *recheck = (bool *) PG_GETARG_POINTER(4);
TRGM *key = (TRGM *) DatumGetPointer(entry->key);
TRGM *qtrg = generate_trgm(VARDATA(query), VARSIZE(query) - VARHDRSZ);
TRGM *qtrg;
bool res = false;
char *cache = (char*) fcinfo->flinfo->fn_extra;
/* All cases served by this function are exact */
*recheck = false;
if ( cache == NULL || VARSIZE(cache) != VARSIZE(query) || memcmp( cache, query, VARSIZE(query) ) !=0 )
{
qtrg = generate_trgm(VARDATA(query), VARSIZE(query) - VARHDRSZ);
if (cache)
pfree(cache);
fcinfo->flinfo->fn_extra = MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
MAXALIGN(VARSIZE(query)) + VARSIZE(qtrg) );
cache = (char*) fcinfo->flinfo->fn_extra;
memcpy( cache, query, VARSIZE(query) );
memcpy( cache + MAXALIGN(VARSIZE(query)), qtrg, VARSIZE(qtrg) );
}
qtrg = (TRGM*)( cache + MAXALIGN(VARSIZE(query)) );
if (GIST_LEAF(entry))
{ /* all leafs contains orig trgm */
float4 tmpsml = cnt_sml(key, qtrg);