Function ExecParallelHashFirstTuple

src/backend/executor/nodeHash.c:3932–3943

* Get the first tuple in a given bucket identified by number. */

 * Get the first tuple in a given bucket identified by number.
 */
static inline HashJoinTuple
ExecParallelHashFirstTuple(HashJoinTable hashtable, int bucketno)
{
	HashJoinTuple tuple;
	dsa_pointer p;

	Assert(hashtable->parallel_state);
	p = dsa_pointer_atomic_read(&hashtable->buckets.shared[bucketno]);
	tuple = (HashJoinTuple) dsa_get_address(hashtable->area, p);

	return tuple;
}

/*
 * Get the next tuple in the same bucket as 'tuple'.