Re: WIP Patch for GROUPING SETS phase 1

Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Sep 9, 2014 at 12:01 PM, Andrew Gierth
> <andrew@tao11.riddles.org.uk> wrote:
>> Honestly, ChainAggregate is _trivial_ compared to trying to make the
>> GroupAggregate code deal with multiple inputs, or trying to make some
>> new sort of plumbing node to feed input to those sorts.  (You'd think
>> that it should be possible to use the existing CTE mechanics to do it,
>> but noooo... the existing code is actively and ferociously hostile to
>> the idea of adding new CTEs from within the planner.)

> That's unfortunate.

I'm less than convinced that it's true ... I've been meaning to find
time to review this patch, but it sounds like it's getting to the point
where I need to.
        regards, tom lane