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https://issues.apache.org/jira/browse/HIVE-14918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15560316#comment-15560316
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Pengcheng Xiong commented on HIVE-14918:
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[~wisgood], i tried on current master, it is working fine. If you have problem
on 2.1, maybe we should backport some patches.
{code}
hive> create table d (c1 string, c2 string, c3 string);
OK
hive> FROM src INSERT OVERWRITE TABLE d SELECT 'abc', 'xyz', '8675309' WHERE
src.key = 86;
Query ID = pxiong_20161009101753_605845db-aeb9-4dab-87d6-5ad51fab1f79
Total jobs = 1
hive> select * from d;
OK
abc xyz 8675309
Time taken: 0.127 seconds, Fetched: 1 row(s)
hive> SELECT concat_ws('.',NULL) FROM d;
OK
Time taken: 0.096 seconds, Fetched: 1 row(s)
{code}
And also, a rewritten query also works fine
{code}
hive> SELECT concat_ws('.',NULL) FROM (SELECT 'abc', 'xyz', '8675309' from src
WHERE src.key = 86)subq;
OK
Time taken: 0.272 seconds, Fetched: 1 row(s)
{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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