RE: Regression on PostgreSQL 10 ORDER/GROUP BY expression not found in targetlist

> On 29 June 2018 at 21:06, Regina Obe <lr@pcorp.us> wrote:
> > I think the exact query that is triggering it is this one though I
> > don't have PostgreSQL 10 head installed locally to confirm.
> >
> > SELECT 't3280', 'L1b' || topology.TopoGeo_AddLinestring('bug3280',
> > geom)  FROM bug3280.edge where edge_id = 1  ORDER BY 1;
>
> Can you try in REL_10_STABLE? There was a fix committed [1] for something
> very similar just a week ago.
>
> [1]
> https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=a4c95b0b80
> c70677c09c0d5c82a6fba875160288
>
> --
>  David Rowley                   http://www.2ndQuadrant.com/
>  PostgreSQL Development, 24x7 Support, Training & Services

Thanks for this input.  I guess I was mistaken about the commit that caused this
and it's most likely this one since this one fails as well.

Here is a trivial example to exercise that doesn't involve PostGIS.

CREATE TABLE edge AS SELECT 1 AS edge_id;
SELECT 't3280', 'L1b' || generate_series(1,10)
FROM edge
ORDER BY 1;


Now that said, I think I should change our test since it's using questionable assumptions anyway.
My only concern with this issue is that it's behavior that was allowed before in 10 a stable branch
and it's changing in a micro release.

I doubt few others would be bitten by though, but probably still worthwhile to put a note about it in the upcoming
releasenotes 
if this new behavior is kept.

Thanks,
Regina Obe