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Re: Refactoring on DROP/ALTER SET SCHEMA/ALTER RENAME TO statement

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp>
Cc: Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, PgHacker <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Refactoring on DROP/ALTER SET SCHEMA/ALTER RENAME TO statement
Date: 2011-11-18 02:33:16
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Lists: pgsql-hackers
On Thu, Nov 17, 2011 at 11:21 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Tue, Nov 15, 2011 at 4:43 AM, Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp> wrote:
>> Part-1) DROP statement refactoring
>> It is a remaining portion of what I submitted in the last commit fest.
>> It allows object types that didn't used DropStmt in gram.y to go
>> through RemoveObjects(), instead of individual RemoveXXXX().
> Review of just this part:
> - I think we can remove the special case for foreign data wrappers
> because (1) the only case in which there's any behavioral difference
> at all is if a superuser creates a foreign data wrapper (or the
> ownership of one is reassigned to him) and he is then made not a
> superuser; non-superusers can't create foreign data wrappers, and
> existing foreign data wrappers can't be given to non-superusers;
> moreover, (2) removing the special case causes the behavior to match
> the documentation, which it currently doesn't (but only in the
> aforementioned, extremely minor way).
> - On the other hand, this patch blithely nukes the prohibition on
> using DROP FUNCTION to remove an aggregate.  I'm not sure that's a
> good idea.  It also eliminates the NOTICE when removing a built-in
> function, which I think is OK because you don't actually get that far:
> rhaas=# drop function int4pl(integer, integer);
> ERROR:  cannot drop function int4pl(integer,integer) because it is
> required by the database system
> - For some reason, we have code that causes procedural language names
> to be downcased before use.  Given that unquoted identifiers are
> downcased anyway, this seems a bit redundant.  I'm inclined to think
> we don't need to preserve that behavior for DROP, especially because
> other parts of the code - such as COMMENT - don't know about it
> anyway.  But rather than just changing it for DROP, I think we should
> go through and rip out case_translate_language_name() across the
> board, probably as a a separate commit.

I've committed part 1 of this patch series after correcting the above items.

Robert Haas
The Enterprise PostgreSQL Company

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