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https://issues.apache.org/jira/browse/SPARK-8240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696471#comment-14696471
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Cheng Hao commented on SPARK-8240:
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It's probably very difficult to define the function when mix the column type
and string type.
> string function: concat
> -----------------------
>
> Key: SPARK-8240
> URL: https://issues.apache.org/jira/browse/SPARK-8240
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 1.5.0
>
>
> concat(string|binary A, string|binary B...): string / binary
> Returns the string or bytes resulting from concatenating the strings or bytes
> passed in as parameters in order. For example, concat('foo', 'bar') results
> in 'foobar'. Note that this function can take any number of input strings.
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