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https://issues.apache.org/jira/browse/HIVE-16768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036634#comment-16036634
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Fei Hui commented on HIVE-16768:
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[~pxiong] HIVE-15517 is not fixed on 2.1.1, should we pick it up on branch-2.1?
> NOT operator returns NULL from result of <=>
> --------------------------------------------
>
> Key: HIVE-16768
> URL: https://issues.apache.org/jira/browse/HIVE-16768
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.1.1
> Reporter: Alexander Sterligov
> Assignee: Fei Hui
>
> {{SELECT "foo" <=> null;}}
> returns {{false}} as expected.
> {{SELECT NOT("foo" <=> null);}}
> returns NULL, but should return {{true}}.
> Workaround is
> {{SELECT NOT(COALESCE("foo" <=> null));}}
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