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From: Bruce Momjian <[email protected]>
To: Tom Lane <[email protected]>
Cc: Jeff Janes <[email protected]>
Cc: [email protected]
Cc: Bill Martin <[email protected]>
Subject: Re: [PERFORM] Planner selects different execution plans depending on limit
Date: Wed, 26 Sep 2012 11:52:12 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <D48BF41C96B16442B542F5E25C259047011E80F02A@COM211.communardo.local>
	<[email protected]>
	<[email protected]>
	<D48BF41C96B16442B542F5E25C259047011E811299@COM211.communardo.local>
	<[email protected]>
	<CAMkU=1xjEXM8PnZaS0bbKVYKhL-j7Ra_WK1hRk2Zv3zsa5xWwA@mail.gmail.com>
	<[email protected]>

On Sun, Sep 16, 2012 at 06:16:55PM -0400, Tom Lane wrote:
> Jeff Janes <[email protected]> writes:
> > On Thu, Sep 13, 2012 at 10:33 AM, Tom Lane <[email protected]> wrote:
> >> Just pretend it's a table.
> >> ALTER TABLE index_name ALTER COLUMN column_name SET STATISTICS ...
> >> 
> >> You'll need to look at the index (eg with \d) to see what the name of
> >> the desired column is, since index expressions have system-assigned
> >> column names.
> 
> > Is this documented anywhere?  I couldn't find it.  If not, which
> > section would be the best one to add it to?
> 
> It's not documented, mainly because it hasn't reached the level of being
> a supported feature.  I'd like to figure out how to get pg_dump to dump
> such settings before we call it supported.  (The stumbling block is
> exactly that index column names aren't set in stone, so it's not clear
> that the ALTER command would do the right thing on dump-and-reload.)

Is this  TODO?

-- 
  Bruce Momjian  <[email protected]>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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