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https://issues.apache.org/jira/browse/HIVE-13861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303212#comment-15303212
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Ashutosh Chauhan commented on HIVE-13861:
-----------------------------------------

+1 pending tests

> Fix up nullability issue that might be created by pull up constants rules
> -------------------------------------------------------------------------
>
>                 Key: HIVE-13861
>                 URL: https://issues.apache.org/jira/browse/HIVE-13861
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 2.1.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-13861.patch
>
>
> When we pull up constants through Union or Sort operators, we might end up 
> rewriting the original expression into an expression whose schema has 
> different nullability properties for some of its columns.
> This results in AssertionError of the following kind:
> {noformat}
> ...
> org.apache.hive.service.cli.HiveSQLException: Error running query: 
> java.lang.AssertionError: Internal error: Cannot add expression of different 
> type to set:
> ...
> {noformat}



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