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https://issues.apache.org/jira/browse/HIVE-5996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13847381#comment-13847381
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Thejas M Nair commented on HIVE-5996:
-------------------------------------
Sorry, I meant even if the input row type is decimal , two rows can overflow
> Query for sum of a long column of a table with only two rows produces wrong
> result
> ----------------------------------------------------------------------------------
>
> Key: HIVE-5996
> URL: https://issues.apache.org/jira/browse/HIVE-5996
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.12.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Attachments: HIVE-5996.patch
>
>
> {code}
> hive> desc test2;
> OK
> l bigint None
> hive> select * from test2;
> OK
> 6666666666666666666
> 5555555555555555555
> hive> select sum(l) from test2;
> OK
> -6224521851487329395
> {code}
> It's believed that a wrap-around error occurred. It's surprising that it
> happens only with two rows. Same query in MySQL returns:
> {code}
> mysql> select sum(l) from test;
> +----------------------+
> | sum(l) |
> +----------------------+
> | 12222222222222222221 |
> +----------------------+
> 1 row in set (0.00 sec)
> {code}
> Hive should accommodate large number of rows. Overflowing with only two rows
> is very unusable.
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