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https://issues.apache.org/jira/browse/HIVE-20319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16630821#comment-16630821
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Alice Fan commented on HIVE-20319:
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HIVE-12812 is committed to master branch today. Let me know if you still see
the same error and can we close this Jira. Thank you for reporting the issue.
> group by and union all always generate empty query result
> ---------------------------------------------------------
>
> Key: HIVE-20319
> URL: https://issues.apache.org/jira/browse/HIVE-20319
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 2.3.2
> Environment: Run on MR, hadoop 2.7.3
> Reporter: Wang Yan
> Priority: Blocker
>
> The following query always generates empty results which is wrong.
> {code:sql}
> create table if not exists test_table(column1 string, column2 int);
> insert into test_table values('a',1),('b',2);
> set hive.optimize.union.remove=true;
> select column1 from test_table group by column1
> union all
> select column1 from test_table group by column1;
> {code}
> Actual result : empty
> Expected result:
> {code:java}
> a
> b
> a
> b
> {code}
> Note that correct result is generated when set
> hive.optimize.union.remove=false.
> It seems like the fix in HIVE-12788 is insufficient.
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