Datum
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);
Datum *entries = NULL;
*nentries = 0;
if (query->size > 0)
{
int4 i,
j = 0,
len;
QueryItem *item;
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")));
item = GETQUERY(query);
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
(*nentries)++;
entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
{
text *txt;
QueryOperand *val = &item[i].operand;
txt = (text *) palloc(VARHDRSZ + val->length);
SET_VARSIZE(txt, VARHDRSZ + val->length);
memcpy(VARDATA(txt), GETOPERAND(query) + val->distance, val->length);
entries[j++] = PointerGetDatum(txt);
if (strategy != TSearchWithClassStrategyNumber && val->weight != 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("@@ operator does not support lexeme weight restrictions in GIN index searches"),
errhint("Use the @@@ operator instead.")));
}
}
else
*nentries = -1; /* nothing can be found */
PG_FREE_IF_COPY(query, 0);
PG_RETURN_POINTER(entries);
}
Datum
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);
Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4);
Datum *entries = NULL;
bool *partialmatch;
*nentries = 0;
if (query->size > 0)
{
int4 i,
j = 0,
len;
QueryItem *item;
bool use_fullscan = false;
int *map_item_operand;
item = clean_NOT(GETQUERY(query), &len);
if (!item)
{
use_fullscan = true;
*nentries = 1;
}
item = GETQUERY(query);
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
(*nentries)++;
entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
partialmatch = *ptr_partialmatch = (bool *) palloc(sizeof(bool) * (*nentries));
/*
* Make map to convert item's number to corresponding operand's (the
* same, entry's) number. Entry's number is used in check array in
* consistent method. We use the same map for each entry.
*/
*extra_data = (Pointer *) palloc0(sizeof(Pointer) * (*nentries));
map_item_operand = palloc0(sizeof(int) * (query->size + 1));
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
{
text *txt;
QueryOperand *val = &item[i].qoperand;
txt = cstring_to_text_with_len(GETOPERAND(query) + val->distance,
val->length);
(*extra_data)[j] = (Pointer) map_item_operand;
map_item_operand[i] = j;
partialmatch[j] = val->prefix;
entries[j++] = PointerGetDatum(txt);
}
if (use_fullscan)
{
(*extra_data)[j] = (Pointer) map_item_operand;
map_item_operand[i] = j;
entries[j++] = PointerGetDatum(cstring_to_text_with_len("", 0));
}
}
else
*nentries = -1; /* nothing can be found */
PG_FREE_IF_COPY(query, 0);
PG_RETURN_POINTER(entries);
}
