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https://issues.apache.org/jira/browse/SPARK-14112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-14112.
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Resolution: Incomplete
> Unique Constraints over a Set of AttributeReferences
> ----------------------------------------------------
>
> Key: SPARK-14112
> URL: https://issues.apache.org/jira/browse/SPARK-14112
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
> Priority: Major
> Labels: bulk-closed
>
> Introduce unique constraints over a set of `AttributeReference`s.
> - Optimizer can remove unnecessary `Distinct` from the plan, as shown in the
> PR: https://github.com/apache/spark/pull/11854.
> - Optimizer can eliminate the no-op `Join` from the plan, as shown in the PR:
> https://github.com/apache/spark/pull/9089
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