From: Tom Lane <tgl@sss.pgh.pa.us>
To: Aidar Uldanov <aidar@donorbox.org>
cc: David Rowley <dgrowleyml@gmail.com>, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18690: A count function returns wrong value when using FDW
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Comments: In-reply-to Aidar Uldanov <aidar@donorbox.org>
	message dated "Wed, 06 Nov 2024 16:10:57 +0100"
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Date: Wed, 06 Nov 2024 10:29:31 -0500
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Aidar Uldanov <aidar@donorbox.org> writes:
> David, after some troubleshooting I found out that the issue with FWD and
> bigint values, so when column type int then it works well but after
> changing to a bigint type a count() function returns the wrong value.

>  create table transactions(
>   id serial primary key,
>   amount int,
>   org_id int,
>   recurring_payment_id int REFERENCES recurring_payments(id)
>  );
> ...
> CREATE FOREIGN TABLE transactions_f (
>     id serial,
>   amount bigint,
>   org_id int,
>   recurring_payment_id int
> )
> SERVER foreign_server
> OPTIONS (schema_name 'public', table_name 'transactions');

While it's sort of interesting that that misbehaves, I do not believe
that postgres_fdw promises to work correctly with foreign-table
definitions that don't match the remote table's actual column
datatypes.

			regards, tom lane