|From:||Ronan Dunklau <ronan(dot)dunklau(at)aiven(dot)io>|
|Cc:||PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, David Zhang <david(dot)zhang(at)highgo(dot)ca>, Zhihong Yu <zyu(at)yugabyte(dot)com>|
|Subject:||Re: ORDER BY pushdowns seem broken in postgres_fdw|
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Le lundi 6 septembre 2021, 11:25:39 CEST Zhihong Yu a écrit :
> On Mon, Sep 6, 2021 at 1:17 AM Ronan Dunklau <ronan(at)dunklau(dot)fr> wrote:
> > Le vendredi 3 septembre 2021, 22:54:25 CEST David Zhang a écrit :
> > > The following review has been posted through the commitfest application:
> > > make installcheck-world: tested, failed
> > > Implements feature: tested, passed
> > > Spec compliant: not tested
> > > Documentation: not tested
> > >
> > > Applied the v6 patch to master branch and ran regression test for
> > contrib,
> > > the result was "All tests successful."
> > What kind of error did you get running make installcheck-world ? If it
> > passed
> > the make check for contrib, I can't see why it would fail running make
> > installcheck-world.
> > In any case, I just checked and running make installcheck-world doesn't
> > produce any error.
> > Since HEAD had moved a bit since the last version, I rebased the patch,
> > resulting in the attached v7.
> > Best regards,
> > --
> > Ronan Dunklau
> bq. a pushed-down order by could return wrong results.
> Can you briefly summarize the approach for fixing the bug in the
> description ?
Done, let me know what you think about it.
> + * Returns true if it's safe to push down a sort as described by 'pathkey'
> + * the foreign server
> + */
> +is_foreign_pathkey(PlannerInfo *root,
> It would be better to name the method which reflects whether pushdown is
> safe. e.g. is_pathkey_safe_for_pushdown.
The convention used here is the same one as in is_foreign_expr and
is_foreign_param, which are also related to pushdown-safety.
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