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https://issues.apache.org/jira/browse/TAJO-956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067910#comment-14067910
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ASF GitHub Bot commented on TAJO-956:
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Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/81#issuecomment-49545196
+1
The patch looks good to me.
> CONCAT should be support multiple params and null param.
> --------------------------------------------------------
>
> Key: TAJO-956
> URL: https://issues.apache.org/jira/browse/TAJO-956
> Project: Tajo
> Issue Type: Improvement
> Reporter: Hyoungjun Kim
> Assignee: Hyoungjun Kim
> Priority: Trivial
>
> Currently Tajo's CONCAT function doesn't support multiple parameters and null
> parameter.
> {noformat}
> default> select concat('aaa', 'bbb', 'ccc');
> ERROR: function concat(text,text,text) does not exist
> default>
> {noformat}
> CONCAT function can be defined as follows.
> {noformat}
> default> select concat(null, 'aaa', null, 'bbb', 'ccc');
> concat
> --------
> aaabbbccc
> {noformat}
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