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https://issues.apache.org/jira/browse/HIVE-17535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170758#comment-16170758
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Ashutosh Chauhan commented on HIVE-17535:
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That is actually a known issue: HIVE-16511
> Select 1 EXCEPT Select 1 fails with NPE
> ---------------------------------------
>
> Key: HIVE-17535
> URL: https://issues.apache.org/jira/browse/HIVE-17535
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Attachments: HIVE-17535.1.patch, HIVE-17535.2.patch,
> HIVE-17535.3.patch
>
>
> Since Hive CBO isn't able to handle queries with no table e.g. {{select 1}}
> queries with SET operators fail (intersect requires CBO).
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