Re: New system catalog idea

I think this is a good idea, and something to add to the TODO list. We
are hitting too many of these gotchas.

* Add pg_depend table to track object dependencies

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> While we're on the subject of new system catalogs, how about a many to many
> catalog like this:
>
> pg_depend (oid obj, oid dep)
>
> That maps the oid of a system object (such as a constraint, index, function,
> trigger, anything) to all other system objects that are dependent upon it.
> Although it may take a bit of work to implement, it will trivialise
> supporting CASCADE/RESTRICT on DROP.
>
> Chris
>
>
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