Change By: Brett Meyer (13/Nov/12 10:54 AM)
Description: Dialect#supportsNotNullUnique is used by 2 areas:

1.) Table.  Prevents "not null unique" if  unsupported by  supportsNotNullUnique is false and  the  dialect  column is not nullable .
2.) UniqueKey.  The logic is reversed from #1.  Appears to prevent unique constraints from being created if supportsNotNullUnique is false and one of the constraint's columns is nullable.

The uses seem inconsistent and incorrect.
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