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https://issues.apache.org/jira/browse/SPARK-17077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784384#comment-15784384
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Apache Spark commented on SPARK-17077:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/16430
> Cardinality estimation project operator
> ---------------------------------------
>
> Key: SPARK-17077
> URL: https://issues.apache.org/jira/browse/SPARK-17077
> Project: Spark
> Issue Type: Sub-task
> Components: Optimizer
> Affects Versions: 2.0.0
> Reporter: Ron Hu
>
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