Re: plan time of MASSIVE partitioning ...

Heikki Linnakangas írta:
> On 26.10.2010 18:34, Boszormenyi Zoltan wrote:
>> thank you very much for pointing me to dynahash, here is the
>> next version that finally seems to work.
>>
>> Two patches are attached, the first is the absolute minimum for
>> making it work, this still has the Tree type for canon_pathkeys
>> and eq_classes got the same treatment as join_rel_list/join_rel_hash
>> has in the current sources: if the list grows larger than 32, a hash
>> table
>> is created. It seems to be be enough for doing in for
>> get_eclass_for_sort_expr()
>> only, the other users of eq_classes aren't bothered by this change.
>
> That's better, but can't you use dynahash for canon_pathkeys as well?

Here's a purely dynahash solution. It's somewhat slower than
the tree version, 0.45 vs 0.41 seconds in the cached case for the
previously posted test case.

Best regards,
Zoltán Böszörményi

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Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
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