Re: WIP: extensible enums

Excerpts from Andrew Dunstan's message of lun ago 23 05:35:09 -0400 2010:

> To add a label at the end of the list, do:
> 
>   ALTER TYPE myenum ADD 'newlabel';
> 
> To add a label somewhere else, do:
> 
>   ALTER TYPE myenum ADD 'newlabel' BEFORE 'existinglabel';
> 
> or
> 
>   ALTER TYPE myenum ADD 'newlabel' AFTER 'existinglabel';

What do you need AFTER for?  Seems to me that BEFORE should be enough.
(You already have the unadorned syntax for adding an item after the last
one, which is the corner case that BEFORE alone doesn't cover).

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Álvaro Herrera <alvherre@commandprompt.com>
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