Re: PoC: Partial sort - Mailing list pgsql-hackers

From Marti Raudsepp
Subject Re: PoC: Partial sort
Date
Msg-id CABRT9RDva32yHfar3iEHYuji2zyi-nAnTam4FAmxzoQGS83hgg@mail.gmail.com
Whole thread Raw
In response to Re: PoC: Partial sort  (Jeremy Harris <jgh@wizmail.org>)
List pgsql-hackers
Funny, I just wrote a patch to do that some minutes ago (didn't see your email yet).

http://www.postgresql.org/message-id/CABRT9RCK=wmFUYZdqU_+MOFW5PDevLxJmZ5B=eTJJNUBvyARxw@mail.gmail.com

Regards,
Marti



On Sat, Jan 18, 2014 at 7:10 PM, Jeremy Harris <jgh@wizmail.org> wrote:
On 13/01/14 18:01, Alexander Korotkov wrote:
Thanks. It's included into attached version of patch. As wall as estimation
improvements, more comments and regression tests fix.

Would it be possible to totally separate the two sets of sort-keys,
only giving the non-index set to the tuplesort?  At present tuplesort
will, when it has a group to sort, make wasted compares on the
indexed set of keys before starting on the non-indexed set.
--
Cheers,
  Jeremy




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