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Re: Hash joins vs small-integer join values

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org, Joseph Shraibman <jks(at)selectacast(dot)net>, Luke Lonergan <llonergan(at)greenplum(dot)com>
Subject: Re: Hash joins vs small-integer join values
Date: 2007-06-01 04:00:55
Message-ID: 16362.1180670455@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Josh Berkus <josh(at)agliodbs(dot)com> writes:
> Tom,
>> The problem is that this is not a back-patchable
>> answer, because changing the hash functions would corrupt existing hash
>> indexes.  

> Does anyone *use* hash indexes?

We get bug reports on 'em, so yes ...

			regards, tom lane

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