Re: about truncate

I wrote:
> Here is the current line-up:
> 
> command                         supports ONLY
> 
> ALTER TABLE all other actions   yes
> ALTER TABLE RENAME COLUMN       yes
> ALTER TABLE RENAME              no
> ALTER TABLE SET SCHEMA          documented no, but accepted and ignored

This is actually a bit worse: All variants of ALTER TABLE accept ONLY, 
but only about half of them are potentially recursive and about half of 
them never recurse, and this is not documented in an obvious place (or 
anywhere).  I have added a Todo list item to sort this out.