| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: [COMMITTERS] pgsql: Fix EquivalenceClass processing for nested append relations. |
| Date: | 2014-03-28 20:36:52 |
| Message-ID: | 29076.1396039012@sss.pgh.pa.us |
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| Lists: | pgsql-committers pgsql-hackers |
David Fetter <david(at)fetter(dot)org> writes:
> On Fri, Mar 28, 2014 at 03:50:10PM +0000, Tom Lane wrote:
>> Fix EquivalenceClass processing for nested append relations.
> If this is a bug fix, shouldn't it be back-patched?
It's a planner improvement; it's not a bug fix in the sense that previous
plans were wrong. We tend to err on the side of not back-patching such
changes ... some people complain when minor updates cause plan choices to
change under them.
regards, tom lane
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