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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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Xiao Li resolved SPARK-19350.
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Resolution: Fixed
Fix Version/s: 2.2.0
> 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
> Assignee: Zhenhua Wang
> Fix For: 2.2.0
>
>
> Currently, LocalLimit/GlobalLimit/Sample propagates the same row count and
> column stats from its child, which is incorrect.
> We can get the correct rowCount in Statistics for Limit/Sample whether cbo is
> enabled or not. And column stats should not be propagated because we don't
> know the distribution of columns after Limit or Sample.
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