provide support for unique constraint over nullable columns
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Key: DERBY-3330
URL: https://issues.apache.org/jira/browse/DERBY-3330
Project: Derby
Issue Type: New Feature
Components: Store
Affects Versions: 10.4.0.0
Environment: all
Reporter: Anurag Shekhar
Assignee: Anurag Shekhar
Allow unique constraint over nullable field. Right now derby support unique
constraint only over not null columns.
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