Re: More stable query plans via more predictable column statistics

From: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: More stable query plans via more predictable column statistics
Date: 2016-02-23 23:30:35
Message-ID: 56CCEB9B.7030908@2ndquadrant.com
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Hi,

On 02/08/2016 03:01 PM, Shulgin, Oleksandr wrote:
>
...
>
> I've incorporated this fix into the v2 of my patch, I think it is
> related closely enough. Also, added corresponding changes to
> compute_distinct_stats(), which doesn't produce a histogram.

I think it'd be useful not to have all the changes in one lump, but
structure this as a patch series with related changes in separate
chunks. I doubt we'd like to mix the changes in a single commit, and it
makes the reviews and reasoning easier. So those NULL-handling fixes
should be in one patch, the MCV patches in another one.

regards

--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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