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Description:
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Dialect#supportsNotNullUnique is used by 2 areas:
1.) Table. Prevents "not null unique" if supportsNotNullUnique is false and the 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.
This came about through HHH-5376 &
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