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https://issues.apache.org/jira/browse/HIVE-14918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561056#comment-15561056
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Xiaowei Wang commented on HIVE-14918:
-------------------------------------
It is true that concat_ws('.',NULL) of MySQL return empty.
https://bugs.mysql.com/bug.php?id=6719
But I and most colleagues of mine don't understand.
Regardless of MySQL aside, which do you think is more reasonable ?
Thanks for your explanation.
> Function concat_ws get a wrong value
> --------------------------------------
>
> Key: HIVE-14918
> URL: https://issues.apache.org/jira/browse/HIVE-14918
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 1.1.1, 2.0.0, 2.1.0, 2.0.1
> Reporter: Xiaowei Wang
> Assignee: Xiaowei Wang
> Priority: Critical
> Fix For: 2.1.0
>
> Attachments: HIVE-14918.0.patch
>
>
> FROM src INSERT OVERWRITE TABLE dest1 SELECT 'abc', 'xyz', '8675309' WHERE
> src.key = 86;
> SELECT concat_ws('.',NULL) FROM dest1 ;
> The result is a empty string "",but I think it should be return NULL .
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