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https://issues.apache.org/jira/browse/SPARK-13092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159988#comment-15159988
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Apache Spark commented on SPARK-13092:
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User 'marmbrus' has created a pull request for this issue:
https://github.com/apache/spark/pull/11338
> Track constraints in ExpressionSet
> ----------------------------------
>
> Key: SPARK-13092
> URL: https://issues.apache.org/jira/browse/SPARK-13092
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Sameer Agarwal
> Assignee: Michael Armbrust
>
> Create a new ExpressionSet that operates similar to an AttributeSet for
> keeping track of constraints. A nice addition to this will be to try and have
> it do other type of canonicalization (i.e. don't allow both a = b and b = a).
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