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https://issues.apache.org/jira/browse/HIVE-8667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190728#comment-14190728
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Gunther Hagleitner commented on HIVE-8667:
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I believe [~ashutoshc] took a look and found the optimization to work properly
with CBO.
> CBO: optimize_nullscan - some TableScans for nullscans appeared after CBO
> -------------------------------------------------------------------------
>
> Key: HIVE-8667
> URL: https://issues.apache.org/jira/browse/HIVE-8667
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Sergey Shelukhin
> Assignee: Gunther Hagleitner
> Fix For: 0.15.0
>
>
> Looks like some rewriting by CBO prevents nullscans from being optimized.
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