Horton

Re: plan time of MASSIVE partitioning ...

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Boszormenyi Zoltan <zb@cybertec.at>, Alvaro Herrera <alvherre@commandprompt.com>, Stephen Frost <sfrost@snowman.net>, Hans-Jürgen Schönig <postgres@cybertec.at>, Robert Haas <robertmhaas@gmail.com>, pgsql-hackers Hackers <pgsql-hackers@postgresql.org>, Josh Berkus <josh@agliodbs.com>
Date: 2010-10-28T13:49:06Z
Lists: pgsql-hackers 
Heikki Linnakangas <heikki.linnakangas@enterprisedb.com> writes:
> Actually, I wonder if we could just have a separate canon_pathkeys list 
> for each EquivalenceClass, instead of one big list in PlannerInfo. I'm 
> not too familiar with equivalence classes and all that,

Hm.  I don't like getting rid of the main canon_pathkeys list like that.
The whole point of a canonical pathkey is that there is only one, so
it seems like we need a central list.  But it might be sane for each
EC to have an additional, side list of PKs made from it.

			regards, tom lane