Function GinBsonExtractQuerySize

pg_documentdb/src/opclass/bson_gin_core.c:2937–2959

* GinBsonExtractQuerySize generates the index term needed to match * $size on dotted path and values. * In this case, we can simply return the term path with a empty array value * The extra data is populated with the desired array size. * The query is expected to be of the format {path}{typeCode}{value} * i.e. a BsonElement. */

 * i.e. a BsonElement.
 */
static Datum *
GinBsonExtractQuerySize(BsonExtractQueryArgs *args)
{
	int32 *nentries = args->nentries;
	bool **partialmatch = args->partialmatch;
	Pointer **extra_data = args->extra_data;
	Datum *entries = (Datum *) palloc(sizeof(Datum));
	pgbsonelement documentElement = args->filterElement;

	*partialmatch = (bool *) palloc(sizeof(bool));
	*nentries = 1;
	**partialmatch = true;

	/* store the query value in extra data - this allows us to compute upper bound using */
	/* this extra value. */
	*extra_data = (Pointer *) palloc(sizeof(int64_t));
	*((int64_t *) *extra_data) = BsonValueAsInt64(&documentElement.bsonValue);

	/* now create a bson for that path which has the min value for the field */
	/* we map this to an empty array since that's the smallest value we'll encounter */
	entries[0] = GenerateEmptyArrayTerm(&documentElement, &args->termMetadata);
	return entries;
}


/*