Function ExecCleanTargetListLength

src/backend/executor/execUtils.c:1204–1218

* Number of items in a tlist, not including any resjunk items */

 * Number of items in a tlist, not including any resjunk items
 */
int
ExecCleanTargetListLength(List *targetlist)
{
	int			len = 0;
	ListCell   *tl;

	foreach(tl, targetlist)
	{
		TargetEntry *curTle = lfirst_node(TargetEntry, tl);

		if (!curTle->resjunk)
			len++;
	}
	return len;
}

/*
 * Return a relInfo's tuple slot for a trigger's OLD tuples.