Function slotAllNulls

src/backend/executor/nodeSubplan.c:763–775

* slotAllNulls: is the slot completely NULL? * * This does not test for dropped columns, which is OK because we only * use it on projected tuples. */

 * use it on projected tuples.
 */
static bool
slotAllNulls(TupleTableSlot *slot)
{
	int			ncols = slot->tts_tupleDescriptor->natts;
	int			i;

	for (i = 1; i <= ncols; i++)
	{
		if (!slot_attisnull(slot, i))
			return false;
	}
	return true;
}

/*
 * slotNoNulls: is the slot entirely not NULL?