Re: ADD/DROP INHERITS

Greg Stark <gsstark@mit.edu> writes:
> I'm a bit confused about what pg_depends entries would be necessary then. If
> there's something like this there:

> Child Table <--(AUTO)-- pg_inherit entry --(NORMAL)-> Parent Table

I think that would work, but it seems pretty baroque.  pg_inherit
entries are not separately accessible SQL objects; not in the sense
that, say, a table's rowtype is.  I think it'd be just about as easy
to leave the catalog definitions as-is and just manually drop the
child-to-parent pg_depend entry.  This would certainly be less code than
all the infrastructure needed to add pg_inherit entries as a separate
kind of dependency object.

I also note that to go in this direction, pg_inherits would need to add
an OID column, and an index on it.

BTW ... are you intending to renumber inhseqno entries of remaining
pg_inherits items after DROP INHERITS?  Which seqno will be assigned
by ADD INHERITS?  This seems like another area in which DROP/ADD will
not be a complete no-op.
        regards, tom lane