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https://issues.apache.org/jira/browse/SPARK-19350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhenhua Wang updated SPARK-19350:
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Summary: Cardinality estimation of Limit and Sample (was: Improve
cardinality estimation of Limit and Sample)
> Cardinality estimation of Limit and Sample
> ------------------------------------------
>
> Key: SPARK-19350
> URL: https://issues.apache.org/jira/browse/SPARK-19350
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zhenhua Wang
>
> Now we can easily get rowCount in Statistics for Limit and Sample whether cbo
> is enabled or not. But column stats should not be propagated because we don't
> know the distribution of columns after Limit or Sample.
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