Re: [PATCH] Alter or rename enum value

> That would require changing it from an AlterEnumStmt to a RenameStmt
> instead.  Those look to me like they're for renaming SQL objects,
> i.e. things addressed by identifiers, whereas enum labels are just
> strings.  Looking at the implementation of a few of the functions called
> by ExecRenameStmt(), they have very little in common with
> RenameEnumLabel() logic-wise.

Yes, you are right that this is not an identifier like others.  On the
other hand, all RENAME xxx TO yyy statements are RenameStmt at the
moment.  I think we better leave the decision to the committer.

>> What is "nbr"?  Why not calling them something like "i" and "val"?
>
> This is the same naming as used in AddEnumLabel(), which I used as a
> guide.

I see.  Judging from there, it should be shortcut for neighbour.  We
better use something else.

>> Maybe we better release them before reporting error, too.  I would
>> release the list after the loop, close the heap before ereport().
>
> As Tom said, this gets released automatically on error, and is again
> similar to how AddEnumLabel() does it.

I still don't see any reason not to ReleaseCatCacheList() after the
loop instead of writing it 3 times.

> Here is an updated patch.

I don't know, if it is used by the committer or not, but "existance"
is a typo on the commit message.

Other than these, it looks good to me.  I am marking it as Ready for Committer.