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Extend GIN to support partial-match searches, and extend tsquery to support

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prefix matching using this facility.

Teodor Sigaev and Oleg Bartunov
This commit is contained in:
Tom Lane
2008-05-16 16:31:02 +00:00
parent e1bdd07c3c
commit e6dbcb72fa
32 changed files with 1284 additions and 508 deletions
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57
src/backend/utils/adt/tsginidx.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/tsginidx.c,v 1.11 2008/04/14 17:05:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/tsginidx.c,v 1.12 2008/05/16 16:31:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,6 +19,46 @@
#include "utils/builtins.h"
Datum
gin_cmp_tslexeme(PG_FUNCTION_ARGS)
{
text *a = PG_GETARG_TEXT_P(0);
text *b = PG_GETARG_TEXT_P(1);
int cmp;
cmp = tsCompareString(
VARDATA(a), VARSIZE(a) - VARHDRSZ,
VARDATA(b), VARSIZE(b) - VARHDRSZ,
false );
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32( cmp );
}
Datum
gin_cmp_prefix(PG_FUNCTION_ARGS)
{
text *a = PG_GETARG_TEXT_P(0);
text *b = PG_GETARG_TEXT_P(1);
#ifdef NOT_USED
StrategyNumber strategy = PG_GETARG_UINT16(2);
#endif
int cmp;
cmp = tsCompareString(
VARDATA(a), VARSIZE(a) - VARHDRSZ,
VARDATA(b), VARSIZE(b) - VARHDRSZ,
true );
if ( cmp < 0 )
cmp = 1; /* prevent continue scan */
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32( cmp );
}
Datum
gin_extract_tsvector(PG_FUNCTION_ARGS)
{
@@ -55,7 +95,9 @@ gin_extract_tsquery(PG_FUNCTION_ARGS)
TSQuery query = PG_GETARG_TSQUERY(0);
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
/* StrategyNumber strategy = PG_GETARG_UINT16(2); */
bool **ptr_partialmatch = (bool**) PG_GETARG_POINTER(3);
Datum *entries = NULL;
bool *partialmatch;
*nentries = 0;
@@ -65,12 +107,14 @@ gin_extract_tsquery(PG_FUNCTION_ARGS)
j = 0,
len;
QueryItem *item;
bool use_fullscan=false;
item = clean_NOT(GETQUERY(query), &len);
if (!item)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("query requires full scan, which is not supported by GIN indexes")));
{
use_fullscan = true;
*nentries = 1;
}
item = GETQUERY(query);
@@ -79,6 +123,7 @@ gin_extract_tsquery(PG_FUNCTION_ARGS)
(*nentries)++;
entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
partialmatch = *ptr_partialmatch = (bool*) palloc(sizeof(bool) * (*nentries));
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
@@ -88,8 +133,12 @@ gin_extract_tsquery(PG_FUNCTION_ARGS)
txt = cstring_to_text_with_len(GETOPERAND(query) + val->distance,
val->length);
partialmatch[j] = val->prefix;
entries[j++] = PointerGetDatum(txt);
}
if ( use_fullscan )
entries[j++] = PointerGetDatum(cstring_to_text_with_len("", 0));
}
else
*nentries = -1; /* nothing can be found */