Re: Improve OR conditions on joined columns (common star schema problem)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Improve OR conditions on joined columns (common star schema problem)
Date: 2017-04-03 18:49:05
Message-ID: 29861.1491245345@sss.pgh.pa.us
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Andres Freund <andres(at)anarazel(dot)de> writes:
> On 2017-02-14 14:18:54 -0500, Tom Lane wrote:
>> One point that could use further review is whether the de-duplication
>> algorithm is actually correct. I'm only about 95% convinced by the
>> argument I wrote in planunionor.c's header comment.

> Are you planning to push this into v10? Given the looming freeze I'm
> inclined to bump this to the next CF.

I'm still not fully convinced the patch is correct, so I have no problem
with bumping it out.

regards, tom lane

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