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https://issues.apache.org/jira/browse/HIVE-14918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561148#comment-15561148
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Pengcheng Xiong commented on HIVE-14918:
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[~wisgood] i just took a look at the link. it was not marked as a bug in MySQL
{code}
[19 Nov 2004 14:21] Sergei Golubchik
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.mysql.com/documentation/ and the instructions on
how to report a bug at http://bugs.mysql.com/how-to-report.php
Additional info:
According to the manual, CONCAT_WS skips any `NULL' values after the separator
argument.
Thus CONCAT_WS(' ', NULL, NULL) has zero strings to concat, and the result,
quite naturally, is empty string. It does not depend on the separator:
mysql> select concat('>', concat_ws('=', NULL, NULL), '<');
+----------------------------------------------+
| concat('>', concat_ws('|', NULL, NULL), '<') |
+----------------------------------------------+
| >< |
+----------------------------------------------+
{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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