Function SearchSysCacheAttName

src/backend/utils/cache/syscache.c:1496–1512

* SearchSysCacheAttName * * This routine is equivalent to SearchSysCache on the ATTNAME cache, * except that it will return NULL if the found attribute is marked * attisdropped. This is convenient for callers that want to act as * though dropped attributes don't exist. */

 * though dropped attributes don't exist.
 */
HeapTuple
SearchSysCacheAttName(Oid relid, const char *attname)
{
	HeapTuple	tuple;

	tuple = SearchSysCache2(ATTNAME,
							ObjectIdGetDatum(relid),
							CStringGetDatum(attname));
	if (!HeapTupleIsValid(tuple))
		return NULL;
	if (((Form_pg_attribute) GETSTRUCT(tuple))->attisdropped)
	{
		ReleaseSysCache(tuple);
		return NULL;
	}
	return tuple;
}

/*
 * SearchSysCacheCopyAttName