RE: POC: postgres_fdw insert batching

From: Amit Langote <amitlangote09@gmail.com>
> I apologize in advance for being maybe overly pedantic, but I noticed
> that, in ExecInitModifyTable(), you decided to place the call outside
> the loop that goes over resultRelations (shown below), although my
> intent was to ask to place it next to the BeginForeignModify() in that
> loop.

Actually, I tried to do it (adding the GetModifyBatchSize() call after BeginForeignModify()), but it failed.  Because
postgresfdwGetModifyBatchSize()wants to know if RETURNING is specified, and ResultRelInfo->projectReturning is created
afterthe above part.  Considering the context where GetModifyBatchSize() implementations may want to know the
environment,I placed the call as late as possible in the initialization phase.  As for the future(?) multi-target DML
statements,I think we can change this together with other many(?) parts that assume a single target table.
 


Regards
Takayuki Tsunakawa