Function ExecFindJunkAttributeInTlist

src/backend/executor/execJunk.c:233–251

* ExecFindJunkAttributeInTlist * * Find a junk attribute given a subplan's targetlist (not necessarily * part of a JunkFilter). */

 * part of a JunkFilter).
 */
AttrNumber
ExecFindJunkAttributeInTlist(List *targetlist, const char *attrName)
{
	ListCell   *t;

	foreach(t, targetlist)
	{
		TargetEntry *tle = lfirst(t);

		if (tle->resjunk && tle->resname &&
			(strcmp(tle->resname, attrName) == 0))
		{
			/* We found it ! */
			return tle->resno;
		}
	}

	return InvalidAttrNumber;
}

/*
 * ExecFilterJunk