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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22601?focusedWorklogId=561985&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-561985 ]

ASF GitHub Bot logged work on HIVE-22601:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 07/Mar/21 15:51
            Start Date: 07/Mar/21 15:51
    Worklog Time Spent: 10m 
      Work Description: okumin opened a new pull request #2042:
URL: https://github.com/apache/hive/pull/2042


   https://issues.apache.org/jira/browse/HIVE-22601
   
   ### What changes were proposed in this pull request?
   A bug fix. Hive can't handle multiple aliases now.
   
   ### Why are the changes needed?
   This bug causes incorrect results. It's inconvenient especially when we use Hivemall. It has UDTFs that return multiple columns.
   
   ### Does this PR introduce _any_ user-facing change?
   Yes, but the current behavior is apparently buggy.
   
   ### How was this patch tested?
   Add 2 test cases.


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 561985)
    Time Spent: 40m  (was: 0.5h)

> 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: 2.1.1, 2.2.0, 2.3.6, 3.1.2
>            Reporter: okumin
>            Assignee: okumin
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-22601.1.patch, HIVE-22601.2.patch, HIVE-22601.3.patch, HIVE-22601.patch
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> 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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