[HACKERS] Bug in DROP NOT NULL

[Christopher Kings-Lynne]

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.

Also, I dont think that ALTER TABLE blah CLUSTER ON foo; actually warns 
about clustering a non-null indexing index.  However, CLUSTER foo ON 
blah; does.

Chris
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