Re: Problem while updating a foreign table pointing to a partitionedtable on foreign server - Mailing list pgsql-hackers

On Mon, Apr 16, 2018 at 7:35 AM, Ashutosh Bapat
<ashutosh.bapat@enterprisedb.com> wrote:
> It does fix the problem. But the patch as is interferes with the way
> we handle tableoid currently. That can be seen from the regression
> diffs that the patch causes.  RIght now, every tableoid reference gets
> converted into the tableoid of the foreign table (and not the tableoid
> of the foreign table). Somehow we need to differentiate between the
> tableoid injected for DML and tableoid references added by the user in
> the original query and then use tableoid on the foreign server for the
> first and local foreign table's oid for the second. Right now, I don't
> see a simple way to do that.

I think that the place to start would be to change this code to use
something other than TableOidAttributeNumber:

+       var = makeVar(parsetree->resultRelation,
+                                 TableOidAttributeNumber,
+                                 OIDOID,
+                                 -1,
+                                 InvalidOid,
+                                 0);

Note that rewriteTargetListUD, which calls AddForeignUpdateTargets,
also contingently adds a "wholerow" attribute which ExecModifyTable()
is able to fish out later.  It seems like it should be possible to add
a "remotetableoid" column that works similarly, although I'm not
exactly sure what would be involved.

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