Re: Bug in DROP NOT NULL

>> I don't think that's a bug.  You may not intend ever to cluster on that
>> index again, and if you try it will tell you about the problem.
> 
> 
> Except it breaks the 'cluster everything' case:
> 
> test=# cluster;
> ERROR:  cannot cluster when index access method does not handle null values
> HINT:  You may be able to work around this by marking column "a" NOT NULL.

Any further comments on this?  I still think it's a bug, ie. an 
invariant that's not being maintained...

Chris