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https://issues.apache.org/jira/browse/SPARK-21990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164327#comment-16164327
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Apache Spark commented on SPARK-21990:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/19216
> QueryPlanConstraints misses some constraints that can be recursively inferred
> -----------------------------------------------------------------------------
>
> Key: SPARK-21990
> URL: https://issues.apache.org/jira/browse/SPARK-21990
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
>
> When I inspected the latest change of SPARK-21979, I found we could miss few
> constraints that can be recursively inferred.
> E.g. consider constraints {{a === b && b === c && a === 1 && b === 5}}.
> Currently we only infer {{a === c && b === 1 && c === 5}}, but {{c === 1}}
> can be also inferred from newly inferred constraint {{a === c}}.
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