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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (JIRA)" <ji...@apache.org> on 2017/09/13 08:41:01 UTC

[jira] [Created] (SPARK-21990) QueryPlanConstraints misses some constraints can be recursively inferred

Liang-Chi Hsieh created SPARK-21990:
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             Summary: QueryPlanConstraints misses some constraints 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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