Re: [PERFORM] Planner selects different execution plans depending on limit

On Sun, Sep 16, 2012 at 06:16:55PM -0400, Tom Lane wrote:
> Jeff Janes <jeff.janes@gmail.com> writes:
> > On Thu, Sep 13, 2012 at 10:33 AM, Tom Lane <tgl@sss.pgh.pa.us> 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  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

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