Re: join pushdown and issue with foreign update - Mailing list pgsql-hackers

From Alexander Pyhalov
Subject Re: join pushdown and issue with foreign update
Date
Msg-id e55f17943f708a265bad9d0015165bb2@postgrespro.ru
Whole thread Raw
In response to Re: join pushdown and issue with foreign update  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: join pushdown and issue with foreign update
List pgsql-hackers
Tom Lane писал 2021-06-01 21:19:
> Alexander Pyhalov <a.pyhalov@postgrespro.ru> writes:
>> What about the following patch?
> 
> ISTM that using a specific rowtype rather than RECORD would be
> quite disastrous from the standpoint of bloating the number of
> distinct resjunk columns we need for a partition tree with a
> lot of children.  Maybe we'll have to go that way, but it seems
> like an absolute last resort.

Why do you think they are distinct?
In suggested patch all of them will have type of the common ancestor 
(root of the partition tree).

> 
> I think a preferable fix involves making sure that the correct
> record-type typmod is propagated to record_in in this context.
> Alternatively, maybe we could insert the foreign table's rowtype
> during execution of the input operation, without touching the
> plan as such.
> 
> Could we start by creating a test case that doesn't involve
> uncommittable hacks to the source code?

Yes, it seems the following works fine to reproduce the issue.

-- 
Best regards,
Alexander Pyhalov,
Postgres Professional
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