Re: ALTER command reworks

2013/1/7 Alvaro Herrera <alvherre@2ndquadrant.com>:
> Tom Lane escribió:
>> Robert Haas <robertmhaas@gmail.com> writes:
>> > On Mon, Jan 7, 2013 at 3:43 PM, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
>
>> >> If this is considered a problem, I think the way to fix it is to have a
>> >> getObjectDescriptionOids() variant that quotes the object name in the
>> >> output.
>>
>> > This sort of thing has been rejected repeatedly in the past on
>> > translation grounds:
>>
>> Yes.  I'm surprised Alvaro isn't well aware of the rules against trying
>> to build error messages out of sentence fragments: see first item under
>> http://www.postgresql.org/docs/devel/static/nls-programmer.html#NLS-GUIDELINES
>
> Actually I'm fully aware of the limitations; I just had a brain fade.  I
> knew there was something wrong with that usage of getObjectDescription,
> but managed to miss what it was exactly.  Doh.  Thankfully there are
> other hackers paying attention.
>
> BTW this patch was correct in this regard in a previous version -- there
> was one separate copy of the error message per object type.  I think
> it's just a matter of returning to that older coding.
>
The attached patch is a rebased version towards the latest master
branch, and fix up the issue around error messages on name conflicts.

I could also find an abused of getObjectDescription() for error message
of namespace conflicts at AlterObjectNamespace_internal().
The newly added ereport_on_namespace_conflict() can handle the
both of cases, so I also replaced it.

As we have a discussion in another thread, we may add special case
handling for functions and collation on checks on namespace conflicts,
however, I didn't tough code path of them, right now.

Thanks,
--
KaiGai Kohei <kaigai@kaigai.gr.jp>