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https://issues.apache.org/jira/browse/HIVE-25409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391581#comment-17391581
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Zhihua Deng commented on HIVE-25409:
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This has been fixed by https://issues.apache.org/jira/browse/HIVE-14715, as RS
shrinks the same keys to reduce the amount of data to be shuffled, leads to a
wrong value type on the value that to be merged on the gby.
> group by the same column result sum result error
> ------------------------------------------------
>
> Key: HIVE-25409
> URL: https://issues.apache.org/jira/browse/HIVE-25409
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.1, 1.2.2
> Environment: hadoop 2.8.5
> hive 1.2.1 or hive 1.2.2
> Reporter: liuguanghua
> Priority: Major
>
> create table test
> (
> a string,
> b string
> );
> insert into table test values ('a','1'),('b','2'),('c','3');
> select a,a,sum(b) from test group by a,a;
>
> this will get the wrong answer. We expect the sum(b),but is will compute the
> sum(a).
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