Re: Allow logical replication to copy tables in binary format

On Tue, Mar 21, 2023 at 2:16 PM Melih Mutlu <m.melihmutlu@gmail.com> wrote:
>
> Amit Kapila <amit.kapila16@gmail.com>, 21 Mar 2023 Sal, 09:03 tarihinde şunu yazdı:
>>
>> On Tue, Mar 21, 2023 at 7:03 AM Peter Smith <smithpb2250@gmail.com> wrote:
>> >
>> >
>> > ======
>> > src/test/subscription/t/014_binary.pl
>> >
>> > 4.
>> > # -----------------------------------------------------
>> > # Test mismatched column types with/without binary mode
>> > # -----------------------------------------------------
>> >
>> > # Test syncing tables with mismatching column types
>> > $node_publisher->safe_psql(
>> > 'postgres', qq(
>> >     CREATE TABLE public.test_mismatching_types (
>> >         a bigint PRIMARY KEY
>> >     );
>> >     INSERT INTO public.test_mismatching_types (a)
>> >         VALUES (1), (2);
>> >     ));
>> >
>> > # Check the subscriber log from now on.
>> > $offset = -s $node_subscriber->logfile;
>> >
>> > # Ensure the subscription is enabled. disable_on_error is still true,
>> > # so the subscription can be disabled due to missing realtion until
>> > # the test_mismatching_types table is created.
>> > $node_subscriber->safe_psql(
>> > 'postgres', qq(
>> >     CREATE TABLE public.test_mismatching_types (
>> >         a int PRIMARY KEY
>> >     );
>> > ALTER SUBSCRIPTION tsub ENABLE;
>> >     ALTER SUBSCRIPTION tsub REFRESH PUBLICATION;
>> >     ));
>> >
>> > ~~
>> >
>> > I found the "Ensure the subscription is enabled..." comment and the
>> > necessity for enabling the subscription to be confusing.
>> >
>> > Can't some complications all be eliminated just by creating the table
>> > on the subscribe side first?
>> >
>>
>> Hmm, that would make this test inconsistent with other tests and
>> probably difficult to understand and extend. I don't like to say this
>> but I think introducing disable_on_error has introduced more
>> complexities in the patch due to the requirement of enabling
>> subscription again and again. I feel it would be better without using
>> disable_on_error option in these tests.
>
>
> While this change would make the test inconsistent, I think it also would make more confusing.
>

I also think so.

> Explaining the issue explicitly with a comment seems better to me than the trick of changing order of table creation
justfor some test cases. 
> But I'm also ok with removing the use of disable_on_error if that's what you agree on.
>

Let's do that way for now.

--
With Regards,
Amit Kapila.