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Posted to issues@spark.apache.org by "Ron Hu (JIRA)" <ji...@apache.org> on 2017/07/05 18:58:00 UTC

[jira] [Created] (SPARK-21322) support histogram in filter cardinality estimation

Ron Hu created SPARK-21322:
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             Summary: support histogram in filter cardinality estimation
                 Key: SPARK-21322
                 URL: https://issues.apache.org/jira/browse/SPARK-21322
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Ron Hu


Histogram is effective in dealing with skewed distribution.  After we generate histogram information for column statistics, we need to adjust filter estimation based on histogram data structure.



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