> On Mon, Aug 5, 2013 at 3:50 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
>> I've been looking at what it would take to do proper cost estimation
>> for the recently-discussed patch to suppress calculation of
>> unnecessary ORDER BY expressions.

> Can you please mention the subject of the thread? I tried to locate the thread
> based on this description, but couldn't locate it.

Please see 

http://www.postgresql.org/message-id/6543.1375470...@sss.pgh.pa.us

Best regards,
Etsuro Fujita



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