postgresql/contrib/intarray/_int_gin.c
2006-05-03 16:31:07 +00:00

101 lines
2.5 KiB
C

#include "_int.h"
PG_FUNCTION_INFO_V1(ginint4_queryextract);
Datum ginint4_queryextract(PG_FUNCTION_ARGS);
Datum
ginint4_queryextract(PG_FUNCTION_ARGS) {
uint32 *nentries = (uint32*)PG_GETARG_POINTER(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
Datum *res = NULL;
*nentries = 0;
if ( strategy == BooleanSearchStrategy ) {
QUERYTYPE *query = (QUERYTYPE*)PG_DETOAST_DATUM_COPY(PG_GETARG_POINTER(0));
ITEM *items = GETQUERY(query);
int i;
if (query->size == 0)
PG_RETURN_POINTER(NULL);
if ( shorterquery(items, query->size) == 0 )
elog(ERROR,"Query requires full scan, GIN doesn't support it");
pfree( query );
query = (QUERYTYPE*)PG_DETOAST_DATUM(PG_GETARG_POINTER(0));
items = GETQUERY(query);
res = (Datum*)palloc(sizeof(Datum) * query->size);
*nentries = 0;
for(i=0;i<query->size;i++)
if ( items[i].type == VAL ) {
res[*nentries] = Int32GetDatum( items[i].val );
(*nentries)++;
}
} else {
ArrayType *query = PG_GETARG_ARRAYTYPE_P(0);
int4 *arr;
uint32 i;
CHECKARRVALID(query);
*nentries=ARRNELEMS(query);
if ( *nentries > 0 ) {
res = (Datum*)palloc(sizeof(Datum) * (*nentries));
arr=ARRPTR(query);
for(i=0;i<*nentries;i++)
res[i] = Int32GetDatum( arr[i] );
}
}
PG_RETURN_POINTER( res );
}
PG_FUNCTION_INFO_V1(ginint4_consistent);
Datum ginint4_consistent(PG_FUNCTION_ARGS);
Datum
ginint4_consistent(PG_FUNCTION_ARGS) {
bool *check = (bool*)PG_GETARG_POINTER(0);
StrategyNumber strategy = PG_GETARG_UINT16(1);
int res=FALSE;
/* we can do not check array carefully, it's done by previous ginarrayextract call */
switch( strategy ) {
case RTOverlapStrategyNumber:
case RTContainedByStrategyNumber:
/* at least one element in check[] is true, so result = true */
res = TRUE;
break;
case RTSameStrategyNumber:
case RTContainsStrategyNumber:
res = TRUE;
do {
ArrayType *query = PG_GETARG_ARRAYTYPE_P(2);
int i, nentries=ARRNELEMS(query);
for(i=0;i<nentries;i++)
if ( !check[i] ) {
res = FALSE;
break;
}
} while(0);
break;
case BooleanSearchStrategy:
do {
QUERYTYPE *query = (QUERYTYPE*)PG_DETOAST_DATUM(PG_GETARG_POINTER(2));
res = ginconsistent( query, check );
} while(0);
break;
default:
elog(ERROR, "ginint4_consistent: unknown strategy number: %d", strategy);
}
PG_RETURN_BOOL(res);
}