Function tlist_has_srf

src/backend/optimizer/plan/transform.c:527–541

* Does target list have SRFs? */

 * Does target list have SRFs?
 */
bool
tlist_has_srf(const Query *query)
{
	if (query->hasTargetSRFs)
	{
		return true;
	}

	if (expression_returns_set((Node *) query->targetList))
	{
		return true;
	}

	return false;
}

/*
 * DISTINCT/DISTINCT ON/ORDER BY optimization.