Function IsCompositeOpClass

pg_documentdb/src/index_am/index_am_utils.c:382–406

* Whether the index relation was created via a composite index opclass */

 * Whether the index relation was created via a composite index opclass
 */
bool
IsCompositeOpClass(Relation indexRelation)
{
	const BsonIndexAmEntry *amEntry = GetBsonIndexAmEntryByIndexOid(
		indexRelation->rd_rel->relam);
	if (amEntry == NULL)
	{
		return false;
	}

	/* Non unique indexes will have 1 attribute that has the entire composite key
	 * Unique indexes will have the first attribute matching non-unique indexes, and the
	 * second attribute matching the unique constraint key.
	 * We put the composite column first just for convenience, so we can keep the order by
	 * and query paths the same between the two.
	 */
	if (IndexRelationGetNumberOfKeyAttributes(indexRelation) == 1 ||
		IndexRelationGetNumberOfKeyAttributes(indexRelation) == 2)
	{
		return indexRelation->rd_opfamily[0] ==
			   amEntry->get_composite_path_op_family_oid();
	}

	return false;
}


bool