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https://issues.apache.org/jira/browse/SPARK-19020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784674#comment-15784674
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Apache Spark commented on SPARK-19020:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/16431
> Cardinality estimation of aggregate operator
> --------------------------------------------
>
> Key: SPARK-19020
> URL: https://issues.apache.org/jira/browse/SPARK-19020
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zhenhua Wang
>
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