[jira] [Work started] (HIVE-22601) Some columns will be lost when a UDTF has multiple aliases in some cases

["okumin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-22601 started by okumin.
-------------------------------------
> Some columns will be lost when a UDTF has multiple aliases in some cases
> ------------------------------------------------------------------------
>
>                 Key: HIVE-22601
>                 URL: https://issues.apache.org/jira/browse/HIVE-22601
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 3.1.2
>            Reporter: okumin
>            Assignee: okumin
>            Priority: Major
>         Attachments: HIVE-22601.patch
>
>
> Only one column will be retained when putting UDTFs with multiple aliases and a top-level UNION together.
> For example, the result of the following SQL should have three columns, c1, c2 and c3.
> {code:java}
> SELECT stack(1, 'a', 'b', 'c') AS (c1, c2, c3)
> UNION ALL
> SELECT stack(1, 'd', 'e', 'f') AS (c1, c2, c3);
> {code}
> However, It's only the c3 column which I can get.
> {code:java}
> +---------+
> | _u1.c3  |
> +---------+
> | c       |
> | f       |
> +---------+
> {code}



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