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https://issues.apache.org/jira/browse/SPARK-19020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-19020:
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Assignee: Apache Spark
> 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
> Assignee: Apache Spark
>
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