Re: POC: GROUP BY optimization - Mailing list pgsql-hackers

>> Again agree. If we have fixed order of columns (ORDER BY) then we should not 
>> try to reorder it. Current patch follows that if I didn't a mistake.
>>
> 
> This part seems to be more a misunderstanding between me and Claudio. I believe 
> Claudio was referring to the column order in a GROUP BY, not ORDER BY. In which 
> case we don't add any Sort, of course.
I hope so

> 
> I'm still opposed to adding arbitrary handicap to prioritize the order specified 
> by user, for the reasons I explained before. We should aim to make the 
> heuristics/costing reliable enough to make this unnecessary.
+1

-- 
Teodor Sigaev                                   E-mail: teodor@sigaev.ru
                                                    WWW: http://www.sigaev.ru/