Function pathkeys_contained_in

src/backend/optimizer/path/pathkeys.c:652–664

* pathkeys_contained_in * Common special case of compare_pathkeys: we just want to know * if keys2 are at least as well sorted as keys1. */

 *	  if keys2 are at least as well sorted as keys1.
 */
bool
pathkeys_contained_in(List *keys1, List *keys2)
{
	switch (compare_pathkeys(keys1, keys2))
	{
		case PATHKEYS_EQUAL:
		case PATHKEYS_BETTER2:
			return true;
		default:
			break;
	}
	return false;
}

/*
 * pathkeys_count_contained_in