[jira] [Work started] (HIVE-13861) Fix up nullability issue that might be created by pull up constants rules

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-13861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-13861 started by Jesus Camacho Rodriguez.
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> 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
>
> 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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