Function SearchSysCacheCopy

src/backend/utils/cache/syscache.c:1417–1433

* SearchSysCacheCopy * * A convenience routine that does SearchSysCache and (if successful) * returns a modifiable copy of the syscache entry. The original * syscache entry is released before returning. The caller should * heap_freetuple() the result when done with it. */

 * heap_freetuple() the result when done with it.
 */
HeapTuple
SearchSysCacheCopy(int cacheId,
				   Datum key1,
				   Datum key2,
				   Datum key3,
				   Datum key4)
{
	HeapTuple	tuple,
				newtuple;

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

/*
 * SearchSysCacheExists