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From "Ron Hu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-21322) support histogram in filter cardinality estimation
Date Wed, 05 Jul 2017 18:58:00 GMT
Ron Hu created SPARK-21322:
------------------------------

             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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