Determines whether the query form needs the extends and group of its input to be evaluated in a SELECT subquery.
Above a group, extends that are not SELECT expressions would be BINDs, evaluated before the grouping.
Without a SELECT clause, a query form can moreover only read the group variables of a group.
The group is found by findAlgGroupBelow, below the chain of extends and orderings of the input.
Determines whether the query form needs the extends and group of its input to be evaluated in a SELECT subquery. Above a group, extends that are not SELECT expressions would be BINDs, evaluated before the grouping. Without a SELECT clause, a query form can moreover only read the group variables of a group. The group is found by findAlgGroupBelow, below the chain of extends and orderings of the input.