Function targetIsInAllPartitionLists

src/backend/optimizer/path/allpaths.c:4318–4331

* targetIsInAllPartitionLists * True if the TargetEntry is listed in the PARTITION BY clause * of every window defined in the query. * * It would be safe to ignore windows not actually used by any window * function, but it's not easy to get that info at this stage; and it's * unlikely to be useful to spend any extra cycles getting it, since * unreferenced window definitions are probably i

 * unreferenced window definitions are probably infrequent in practice.
 */
static bool
targetIsInAllPartitionLists(TargetEntry *tle, Query *query)
{
	ListCell   *lc;

	foreach(lc, query->windowClause)
	{
		WindowClause *wc = (WindowClause *) lfirst(lc);

		if (!targetIsInSortList(tle, InvalidOid, wc->partitionClause))
			return false;
	}
	return true;
}

/*
 * qual_is_pushdown_safe - is a particular rinfo safe to push down?