>> Partitions can also be foreign tables, although they have some limitations that normal tables do not; see CREATE FOREIGN TABLE for more information
For example
Partitions can also be foreign tables only in case main table is non indexed and doesn't contain PK, although they have some limitations that normal tables do not; see CREATE FOREIGN TABLE for more information
--- Original message --- From: "Alvaro Herrera" <alvherre@2ndquadrant.com> Date: 29 March 2019, 16:11:04
On 2019-Mar-29, Tom Lane wrote:
> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> > On 2019-Mar-29, PG Bug reporting form wrote:
> >> SQL Error [42809]: ERROR: cannot create index on foreign table "msg_json"
>
> > Ah, this is because we try to propagate the index to the partition,
> > which appears to be less than desirable. Maybe this patch fixes it? I
> > have not tested it, only verified that it compiles.
>
> Really, what *ought* to happen in such a case is that the FDW gets
> told about the command and has the opportunity to try to do something
> corresponding to making an index. But that smells like a new feature
> rather than a bug fix.
ENOTIME to get it done for pg12 I suppose (I don't know a thing about
postgres_fdw or the FDW API layer).
> I'm not sure that just forcing the case to be a no-op is wise.
> What if the index is supposed to be UNIQUE?
Hmm, good point, that should be disallowed too.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
