>
> transformSortClause is passed the untransformed aggorder list, which is
> in fact a list of SortBy nodes, and it returns the transformed list
> (SortGroupClause nodes), which is stored back into the aggorder field
> a bit further down.
>
> There are a number of regression tests that would fail in obvious ways
> if this code didn't work.
>
> Right Tom. I got confused, because the comment at Aggref struct definition
told that it is a list of SortGroupClause. May be you can update your
comments there.
Thanks,
Gokul.