Function SearchSysCacheExists

src/backend/utils/cache/syscache.c:1441–1455

* SearchSysCacheExists * * A convenience routine that just probes to see if a tuple can be found. * No lock is retained on the syscache entry. */

 * No lock is retained on the syscache entry.
 */
bool
SearchSysCacheExists(int cacheId,
					 Datum key1,
					 Datum key2,
					 Datum key3,
					 Datum key4)
{
	HeapTuple	tuple;

	tuple = SearchSysCache(cacheId, key1, key2, key3, key4);
	if (!HeapTupleIsValid(tuple))
		return false;
	ReleaseSysCache(tuple);
	return true;
}

/*
 * GetSysCacheOid