| From: | Boszormenyi Zoltan <zb(at)cybertec(dot)at> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: plan time of MASSIVE partitioning ... |
| Date: | 2010-09-08 17:05:59 |
| Message-ID: | 4C87C277.9000804@cybertec.at |
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| Lists: | pgsql-hackers |
Tom Lane írta:
> Boszormenyi Zoltan <zb(at)cybertec(dot)at> writes:
>
>> This applies to anything else that may need to be converted
>> from list to tree to decrease planning time. Like ec_members
>> in EquivalenceClass.
>>
>
> AFAIR, canonical pathkeys are the *only* thing in the planner where pure
> pointer equality is interesting. So I doubt this hack is of any use for
> EquivalenceClass, even if the lists were likely to be long which they
> aren't.
>
> regards, tom lane
>
No, for EquivalanceClass->ec_member, I need to do something
funnier, like implement compare(Node *, Node *) and use that
instead of equal(Node *, Node *)... Something like nodeToString()
on both Node * and strcmp() the resulting strings.
--
----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria
Web: http://www.postgresql-support.de
http://www.postgresql.at/
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