Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets

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От Tom Lane
Тема Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets
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Msg-id 14295.1225898441@sss.pgh.pa.us
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Ответ на Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets  (Joshua Tolley <eggyknap@gmail.com>)
Ответы Re: Proposed Patch to Improve Performance of Multi-Batch Hash Join for Skewed Data Sets  ("Joshua Tolley" <eggyknap@gmail.com>)
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Joshua Tolley <eggyknap@gmail.com> writes:
> On Mon, Oct 20, 2008 at 03:42:49PM -0700, Lawrence, Ramon wrote:
>> We propose a patch that improves hybrid hash join's performance for large
>> multi-batch joins where the probe relation has skew.

> I also recommend modifying docs/src/sgml/config.sgml to include the
> enable_hashjoin_usestatmcvs option.

If the patch is actually a win, why would we bother with such a GUC
at all?
        regards, tom lane


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