On Tue, Feb 2, 2021 at 6:49 PM Peter Eisentraut
<peter.eisentraut@2ndquadrant.com> wrote:
>
> I do wonder, however, under what circumstances code would be put into a
> situation where it would add the exact same dependency again, and also
> under what circumstances it would add a dependency between the same
> objects but a different deptype, and how that would work during
> recursive deletion. Now that we have the refobjversion column, the
> presence of duplicate dependencies might be even more dubious. I think
> that could be worth analyzing.
There's at least dependencies from indexes to pg_class (underlying
table) and pg_collation that can be entirely duplicated (if the same
column and/or collation is used in both key and predicate for
instance), and this was the case before refobjversion was introduced.