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GIN: Generalized Inverted iNdex.

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text[], int4[], Tsearch2 support for GIN.
This commit is contained in:
Teodor Sigaev
2006-05-02 11:28:56 +00:00
parent 427c6b5b98
commit 8a3631f8d8
49 changed files with 5871 additions and 50 deletions
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145
contrib/tsearch2/ginidx.c Normal file
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#include "postgres.h"
#include <float.h>
#include "access/gist.h"
#include "access/itup.h"
#include "access/tuptoaster.h"
#include "storage/bufpage.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "tsvector.h"
#include "query.h"
#include "query_cleanup.h"
PG_FUNCTION_INFO_V1(gin_extract_tsvector);
Datum gin_extract_tsvector(PG_FUNCTION_ARGS);
Datum
gin_extract_tsvector(PG_FUNCTION_ARGS) {
tsvector *vector = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
uint32 *nentries = (uint32*)PG_GETARG_POINTER(1);
Datum *entries = NULL;
*nentries = 0;
if ( vector->size > 0 ) {
int i;
WordEntry *we = ARRPTR( vector );
*nentries = (uint32)vector->size;
entries = (Datum*)palloc( sizeof(Datum) * vector->size );
for(i=0;i<vector->size;i++) {
text *txt = (text*)palloc( VARHDRSZ + we->len );
VARATT_SIZEP(txt) = VARHDRSZ + we->len;
memcpy( VARDATA(txt), STRPTR( vector ) + we->pos, we->len );
entries[i] = PointerGetDatum( txt );
we++;
}
}
PG_FREE_IF_COPY(vector, 0);
PG_RETURN_POINTER(entries);
}
PG_FUNCTION_INFO_V1(gin_extract_tsquery);
Datum gin_extract_tsquery(PG_FUNCTION_ARGS);
Datum
gin_extract_tsquery(PG_FUNCTION_ARGS) {
QUERYTYPE *query = (QUERYTYPE*) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
uint32 *nentries = (uint32*)PG_GETARG_POINTER(1);
StrategyNumber strategy = DatumGetUInt16( PG_GETARG_DATUM(2) );
Datum *entries = NULL;
*nentries = 0;
if ( query->size > 0 ) {
int4 i, j=0, len;
ITEM *item;
item = clean_NOT_v2(GETQUERY(query), &len);
if ( !item )
elog(ERROR,"Query requires full scan, GIN doesn't support it");
item = GETQUERY(query);
for(i=0; i<query->size; i++)
if ( item[i].type == VAL )
(*nentries)++;
entries = (Datum*)palloc( sizeof(Datum) * (*nentries) );
for(i=0; i<query->size; i++)
if ( item[i].type == VAL ) {
text *txt;
txt = (text*)palloc( VARHDRSZ + item[i].length );
VARATT_SIZEP(txt) = VARHDRSZ + item[i].length;
memcpy( VARDATA(txt), GETOPERAND( query ) + item[i].distance, item[i].length );
entries[j++] = PointerGetDatum( txt );
if ( strategy == 1 && item[i].weight != 0 )
elog(ERROR,"With class of lexeme restrictions use @@@ operation");
}
}
PG_FREE_IF_COPY(query, 0);
PG_RETURN_POINTER(entries);
}
typedef struct {
ITEM *frst;
bool *mapped_check;
} GinChkVal;
static bool
checkcondition_gin(void *checkval, ITEM * val) {
GinChkVal *gcv = (GinChkVal*)checkval;
return gcv->mapped_check[ val - gcv->frst ];
}
PG_FUNCTION_INFO_V1(gin_ts_consistent);
Datum gin_ts_consistent(PG_FUNCTION_ARGS);
Datum
gin_ts_consistent(PG_FUNCTION_ARGS) {
bool *check = (bool*)PG_GETARG_POINTER(0);
QUERYTYPE *query = (QUERYTYPE*) PG_DETOAST_DATUM(PG_GETARG_DATUM(2));
bool res = FALSE;
if ( query->size > 0 ) {
int4 i, j=0;
ITEM *item;
GinChkVal gcv;
gcv.frst = item = GETQUERY(query);
gcv.mapped_check= (bool*)palloc( sizeof(bool) * query->size );
for(i=0; i<query->size; i++)
if ( item[i].type == VAL )
gcv.mapped_check[ i ] = check[ j++ ];
res = TS_execute(
GETQUERY(query),
&gcv,
true,
checkcondition_gin
);
}
PG_FREE_IF_COPY(query, 2);
PG_RETURN_BOOL(res);
}