On Fri, Aug 14, 2026 at 3:59 PM shveta malik <[email protected]> wrote: > > On Thu, Aug 13, 2026 at 12:52 PM Peter Smith <[email protected]> wrote: > > > > > > 2b. > > /In the partition case/For partitions/ > > > > AFAICT this case is referring to something like: "FOR TABLE part, > > TABLES IN SCHEMA EXCEPT (part_root)" > > > > But, isn't that just a variation of the 1st case issue? e.g. where > > table "part" is not yet visible for later lookup of "root", then you > > wont be able to check integrity of the partition tree regardless of > > the up/down traversal logic, so I wasn't sure why this 2nd case was > > separately mentioned at all. > > The second point is different from the first. Consider this case: > > CREATE PUBLICATION pub1 FOR s2.tab_part; > ALTER PUBLICATION pub1 ADD TABLES IN SCHEMA s2 EXCEPT (TABLE tab_root); > > Here, the partition entry in pg_publication_rel is visible to the > second command in publication_add_relation() and in > check_publication_add_relation(). But the checks there are not > sufficient to identify the error. If we try to detect the error while > adding tab_root in publication_add_relation(), > we would need to perform a full descendant search to determine whether > any of its descendants are already present in pg_publication_rel. This > downward traversal is what we are trying to avoid in > publication_add_relation(). Geenrally we rely on ancestor-lookup and > we want to stick to that instead of introducing a new logic. > Thus the logic in CheckExceptNotInTableList() is needed here. It reads > all explicitly added entries from pg_publication_rel, looks up their > ancestors to find the root, and checks the EXCEPT entries against that > root. > > This is my understanding, let's wait for Nisha's comments as well. >
Shveta, thanks for the explanation. In hindsight, my confusion was due to the comment wording -- the 1st case was referring to "a single command", and the 2nd case just said, "root may be added to the EXCEPT list later.".... I misinterpreted "later" as meaning later in the *same* command, like: CREATE PUBLICATION pub1 FOR TABLE s2.tab_part, TABLES IN SHEMA s2 EXCEPT(TABLE tab_root); which is entirely a different horse.... Perhaps the comments for these tricky cases should include tiny SQL examples (just like you wrote) to clarify exactly what the comment is trying to say. ====== Kind Regards, Peter Smith. Fujitsu Australia
