Re: BUG #18644: ALTER PUBLICATION ... SET (publish_via_partition_root) wrong/undocumented behavior.

> Can you tell us what additional information you want to document other
> than what is already documented in CREATE PUBLICATION [1] related to
> this parameter?

At least put a warning that alter publication set
(publish_via_partition_root) will unrecoverable break any existing
logical replication subscribers if there at least one partitioned
table with data in replication set,
so alter publication set (publish_via_partition_root) should be run
only before any subscription activation.
Ideally - make this use case actually working (but looking into the
code - it would be very complicated I feel).

>>It would be useful if you can create a small test case to show the exact problem and what is your usecase for the same?
Usecase - after initial load of logical replica I decided that on the
replica I better split future data into weekly partitions due huge
size (instead of monthly partitions on the master/publisher)
exactly the case for "alter publication set (publish_via_partition_root)".

My main issues with this case - there is no way to fix this problem if
it happened less than reloading whole logical replication from blank.

--
Maxim Boguk
Senior Postgresql DBA

Phone UA: +380 99 143 0000
Phone AU: +61 45 218 5678