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Thread: Segfault on updating foreign table

Segfault on updating foreign table

From
Lukáš Sobotka
Date:
Hi there,

I tried to synchronize two tables on different databases using foreign data wrapper. I executed update of foreign table with sub-query selection from local table. As the result I got segmentation fault. General query:
UPDATE foreign_table SET (col) = (
    SELECT col
        FROM local_table
        WHERE foreign_table.id = local_table.id
);

I am not looking for working or better solution, I just want let you know about this. I think the query is according documentation and segfault is not suitable result. If somebody could check it I would be grateful.

For reproducer or log see attachments.
Tested on Ubuntu 18.04.3 LTS with PG12: PostgreSQL 12.1 (Ubuntu 12.1-1.pgdg18.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0, 64-bit

Thanks for your time.

Best regards,
Lukas
Attachment

Re: Segfault on updating foreign table

From
Tom Lane
Date:
=?UTF-8?B?THVrw6HFoSBTb2JvdGth?= <sobotka.luk@gmail.com> writes:
> I tried to synchronize two tables on different databases using foreign data
> wrapper. I executed update of foreign table with sub-query selection from
> local table. As the result I got segmentation fault. General query:
> UPDATE foreign_table SET (col) = (
>     SELECT col
>         FROM local_table
>         WHERE foreign_table.id = local_table.id
> );

Yup, that's a bug.  Will fix, thanks for the report!

            regards, tom lane