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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