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https://issues.apache.org/jira/browse/SPARK-21975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296824#comment-16296824
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Wenchen Fan commented on SPARK-21975:
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[~ZenWzh] any more subtasks for this JIRA?
> Histogram support in cost-based optimizer
> -----------------------------------------
>
> Key: SPARK-21975
> URL: https://issues.apache.org/jira/browse/SPARK-21975
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Zhenhua Wang
>
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