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https://issues.apache.org/jira/browse/SPARK-21322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258596#comment-16258596
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Apache Spark commented on SPARK-21322:
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User 'ron8hu' has created a pull request for this issue:
https://github.com/apache/spark/pull/19783
> 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: 2.3.0
> 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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