Function fetch_tuple_flag

src/backend/executor/nodeSetOp.c:101–114

* Fetch the "flag" column from an input tuple. * This is an integer column with value 0 for left side, 1 for right side. */

 * This is an integer column with value 0 for left side, 1 for right side.
 */
static int
fetch_tuple_flag(SetOpState *setopstate, TupleTableSlot *inputslot)
{
	SetOp	   *node = (SetOp *) setopstate->ps.plan;
	int			flag;
	bool		isNull;

	flag = DatumGetInt32(slot_getattr(inputslot,
									  node->flagColIdx,
									  &isNull));
	Assert(!isNull);
	Assert(flag == 0 || flag == 1);
	return flag;
}

/*
 * Initialize the hash table to empty.