Re: add_partial_path() may remove dominated path but still in use

Robert Haas <robertmhaas@gmail.com>

From: Robert Haas <robertmhaas@gmail.com>
To: Kohei KaiGai <kaigai@heterodb.com>
Cc: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>, Tom Lane <tgl@sss.pgh.pa.us>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2019-01-11T16:36:43Z
Lists: pgsql-hackers
On Thu, Jan 10, 2019 at 9:10 PM Kohei KaiGai <kaigai@heterodb.com> wrote:
> 2019年1月11日(金) 5:52 Robert Haas <robertmhaas@gmail.com>:
> > On Wed, Jan 9, 2019 at 12:44 AM Kohei KaiGai <kaigai@heterodb.com> wrote:
> > > So, is it sufficient if set_rel_pathlist_hook is just relocated in
> > > front of the generate_gather_paths?
> > > If we have no use case for the second hook, here is little necessity
> > > to have the post_rel_pathlist_hook() here.
> > > (At least, PG-Strom will use the first hook only.)
> >
> > +1.  That seems like the best way to be consistent with the principle
> > that we need to have all the partial paths before generating any
> > Gather paths.
> >
> Patch was updated, just for relocation of the set_rel_pathlist_hook.
> Please check it.

Seems reasonable to me.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


Commits

  1. Call set_rel_pathlist_hook before generate_gather_paths, not after.