Christopher Kings-Lynne <chriskl@familyhealth.com.au> writes:
>> You can drop a NOT NULL on a column, even if that column is part of an
>> index that is clustered, where the index does not index NULLs.
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.
regards, tom lane