Re: hash index improving v3 - Mailing list pgsql-patches

From Tom Lane
Subject Re: hash index improving v3
Date
Msg-id 12087.1220581145@sss.pgh.pa.us
Whole thread Raw
In response to Re: hash index improving v3  ("Alex Hunsaker" <badalex@gmail.com>)
List pgsql-patches
"Alex Hunsaker" <badalex@gmail.com> writes:
> On Thu, Sep 4, 2008 at 7:13 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> * check that the queries actually use the indexes (not sure that the
>> proposed switch settings ensure this, not to mention you didn't create
>> the indexes)

> Well I was assuming I could just test the speed of a hash join...

Uh, no, hash joins have nearly zip to do with hash indexes.  They rely
on the same per-datatype support functions but that's the end of the
commonality.

            regards, tom lane

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