From: | Abhijit Menon-Sen <ams(at)2ndQuadrant(dot)com> |
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To: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Use unique index for longer pathkeys. |
Date: | 2014-07-07 12:23:39 |
Message-ID: | 20140707122339.GA13469@toroid.org |
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Lists: | pgsql-hackers |
Hi.
I took a quick look at this patch, more or less because nobody else did.
> Duing last CF, I proposed to match long pathkeys against index columns
> during creating index paths. This worked fine but also it is difficult
> to make sure that all side-effects are eliminated. Finally Tom Lane
> suggested to truncate pathkeys while generation of the pathkeys
> itself. So this patch comes.
I found your older patch quite straightforward to understand, but the
new one much more difficult to follow (but that's not saying much, I
am not very familiar with the planner code in general).
Do you have any references to the discussion about the side-effects that
needed to be eliminated with the earlier patch?
-- Abhijit
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