On Mon, May 15, 2017 at 3:22 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Jeff Janes <jeff.ja...@gmail.com> writes: > > I've tried versions 9.6.3 and 10dev, and neither do what I expected. It > > doesn't seem to be a planning problem where it thinks the fast plan is > > slower, it just doesn't seem to consider the faster plans as being > options > > at all. Is there some setting to make it realize the cast is shippable? > > AFAICS, postgres_fdw doesn't have any knowledge of CoerceViaIO parse > nodes, so it's never going to consider this type of brute-force cast > as shippable. Normal casts would presumably be shippable if the > underlying function is considered safe. > So then, the secret is to write it like this: explain analyze select data from remote2 join remote1 on (int8in(textout( remote2.id)) = remote1.id) where cutoff > 0.9999; This works to have the join pushed to the foreign side in 9.6, but not before that. Thanks, Jeff
