Re: Logical Replication - behavior of ALTER PUBLICATION .. DROP TABLE and ALTER SUBSCRIPTION .. REFRESH PUBLICATION

On Thu, 14 Jan 2021 at 20:19, Bharath Rupireddy wrote:
> On Thu, Jan 14, 2021 at 5:36 PM Li Japin <japinli@hotmail.com> wrote
>> Do we really need to access PUBLICATIONRELMAP in this patch? What if
>> we just set it to false in the else condition of (if (publish &&
>> (relkind != RELKIND_PARTITIONED_TABLE || pub->pubviaroot)))
>>
>> Thank for you review. I agree with you, it doesn’t need to access PUBLICATIONRELMAP, since
>> We already get the publication oid in GetRelationPublications(relid) [1], which also access
>> PUBLICATIONRELMAP.  If the current pub->oid does not in pubids, the publish is false, so we
>> do not need publish the table.
>
> +1. This is enough.
>
>> I have another question, the data->publications is a list, when did it has more then one items?
>
> IIUC, when the single table is associated with multiple publications,
> then data->publications will have multiple entries. Though I have not
> tried, we can try having two or three publications for the same table
> and verify that.
>

I try add one table into two publications, but the data->publications has only
one item.  Is there something I missed?

--
Regrads,
Japin Li.
ChengDu WenWu Information Technology Co.,Ltd.