Re: [v9.2] DROP statement reworks

On Mon, Oct 10, 2011 at 1:38 PM, Kohei KaiGai <kaigai@kaigai.gr.jp> wrote:
> I'm sorry again. I tought it was obvious from the filenames.

I guess I got confused because you re-posted part 2 without the other
parts, and I got mixed up and thought you were reposting part one.

I've committed a stripped-down version of the part one patch, which
had several mistakes even in just the part I committed - e.g., you
forgot TABLESPACEOID.  I also did some renaming for clarity.

I'm going to throw this back to you for rebasing at this point, which
I realize is going to be somewhat of an unenjoyable task given the way
I cut up your changes to objectaddress.c, but I wasn't very confident
that all of the entries were correct (the one for attributes seemed
clearly wrong to me, for example), and I didn't want to commit a bunch
of stuff that wasn't going to be exercised.  I suggest that you merge
the remainder of the part-one changes into part-two.  On the flip
side, I think you should take the stuff that deals with dropping
relations OUT of part two.  I don't see what good it does us to try to
centralize the drop logic if we still have to have special cases for
relations, so let's just leave that separate for now until we figure
out a better approach, or at least split it off as a separate patch so
that it doesn't hold up all the other changes.

I think get_object_namespace() needs substantial revision.  Instead of
passing the object type and the object address, why not just pass the
object address?  You should be able to use the classId in the address
to figure out everything you need to know.  Since this function is
private to objectaddress.c, there's no reason for it to use those
accessor functions - it can just iterate through the array just as
object_exists() does.  That way you also avoid iterating through the
array multiple times.  I also think that we probably ought to revise
AlterObjectNamespace() to make use of this new machinery, instead of
making the caller pass in all the same information that
objectaddress.c is now learning how to provide.  That would possibly
open the way to a bunch more consolidation of the SET SCHEMA code; in
fact, we might want to clean that up first, before dealing with the
DROP stuff.

-- 
Robert Haas
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