Re: Querying foreign table with SP-GiST index results in “ERROR: cache lookup failed for type 0”

On Tue, Jun 18, 2019 at 9:22 PM Jeff Janes <jeff.janes@gmail.com> wrote:
> On Tue, Jun 18, 2019 at 8:02 AM Joao Ferreira <jpgferreira@yahoo.com> wrote:
>> I'm using PostgreSQL 11.3 and I want to access a table in another Postgres database using postgres_fdw but since the
originaltable has an SP-GiST index on a geometry column, the query on the foreign table fails with "ERROR: cache lookup
failedfor type 0", even if the table is empty (Step 7). This doesn't happen if the query is done directly to the remote
table(Steps 3 and 6) or if the remote table doesn't have the index (Steps 3 and 4). 

I started working on this.

> I've verified this on ubuntu 18.04 with 11.3 installed from PGDG apt repo, and attached a single-file reproduction.

I've also verified this on my environment with PG 11.4.

> If I change from sp-gist to just gist, there is no problem.  And if I change to indexing a built-in sp-gist operator
class(point rather than geom), there is also no problem. 

Verified.

Will continue investigations.

Best regards,
Etsuro Fujita