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https://issues.apache.org/jira/browse/HIVE-14918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15560808#comment-15560808
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Pengcheng Xiong commented on HIVE-14918:
----------------------------------------
Initially when it was developed, it was following MySQL.
{code}
mysql> SELECT concat_ws('.',NULL) FROM (SELECT 'abc', 'xyz', '8675309' from t
WHERE t.test = 86)subq;
+---------------------+
| concat_ws('.',NULL) |
+---------------------+
| |
+---------------------+
1 row in set (0.13 sec)
{code}
> 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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