Re: Patch for removng unused targets

Hi Alexander,

I wrote:
> > > From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
>
> > > resjunk means that the target is not supposed to be output by the query.
> > > Since it's there at all, it's presumably referenced by ORDER BY or GROUP
> > > BY or DISTINCT ON, but the meaning of the flag doesn't depend on that.
>
> > > What you would need to do is verify that the target is resjunk and not
> > > used in any clause besides ORDER BY.  I have not read your patch, but
> > > I rather imagine that what you've got now is that the parser checks this
> > > and sets the new flag for consumption far downstream.  Why not just make
> > > the same check in the planner?
>
> > I've created a patch using this approach.
>
> I've rebased the above patch against the latest head.  Could you review the
> patch?  If you have no objection, I'd like to mark the patch "ready for
> committer".

Sorry, I've had a cleanup of the patch.  Please find attached the patch.

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With best regards,
Alexander Korotkov.