Function ginint4_queryextract

contrib/intarray/_int_gin.c:12–105

PG_FUNCTION_INFO_V1(ginint4_queryextract);

Datum
ginint4_queryextract(PG_FUNCTION_ARGS)
{
	int32	   *nentries = (int32 *) PG_GETARG_POINTER(1);
	StrategyNumber strategy = PG_GETARG_UINT16(2);
	int32	   *searchMode = (int32 *) PG_GETARG_POINTER(6);
	Datum	   *res = NULL;

	*nentries = 0;

	if (strategy == BooleanSearchStrategy)
	{
		QUERYTYPE  *query = PG_GETARG_QUERYTYPE_P(0);
		ITEM	   *items = GETQUERY(query);
		int			i;

		/* empty query must fail */
		if (query->size <= 0)
			PG_RETURN_POINTER(NULL);

		/*
		 * If the query doesn't have any required primitive values (for
		 * instance, it's something like '! 42'), we have to do a full index
		 * scan.
		 */
		if (query_has_required_values(query))
			*searchMode = GIN_SEARCH_MODE_DEFAULT;
		else
			*searchMode = GIN_SEARCH_MODE_ALL;

		/*
		 * Extract all the VAL items as things we want GIN to check for.
		 */
		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);

		CHECKARRVALID(query);
		*nentries = ARRNELEMS(query);
		if (*nentries > 0)
		{
			int32	   *arr;
			int32		i;

			res = (Datum *) palloc(sizeof(Datum) * (*nentries));