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https://issues.apache.org/jira/browse/HIVE-29627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cyan Zheng reassigned HIVE-29627:
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Assignee: Cyan Zheng
> Improve IS_NULL selectivity
> ---------------------------
>
> Key: HIVE-29627
> URL: https://issues.apache.org/jira/browse/HIVE-29627
> Project: Hive
> Issue Type: Improvement
> Reporter: Ruben Q L
> Assignee: Cyan Zheng
> Priority: Major
>
> Currently IS_NULL selectivity computation in FilterSelectivityEstimator does
> not have any special treatment, and just goes over the default computation.
> However, if statistics are available, we could get a much better estimation
> (as it already happens with IS_NOT_NULL) by using numberOfNulls / numRows
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