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https://issues.apache.org/jira/browse/SPARK-22771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290160#comment-16290160
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Xiao Li commented on SPARK-22771:
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This looks reasonable. We should fix it.
> SQL concat for binary
> ----------------------
>
> Key: SPARK-22771
> URL: https://issues.apache.org/jira/browse/SPARK-22771
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Fernando Pereira
> Priority: Minor
>
> spark.sql {{concat}} function automatically casts arguments to StringType
> and returns a String.
> This might be the behavior of traditional databases, however in Spark there's
> Binary as a standard type, and concat'ing binary seems reasonable if it
> returns another binary sequence.
> Taking the example of, e.g. Python where both {{bytes}} and {{unicode}}
> represent text, by concat'ing both we end up with the same type as the
> arguments, and in case they are intermixed (str + unicode) the most generic
> type is returned (unicode).
> Following the same principle, I believe that when concat'ing binary it would
> make sense to return a binary.
> In terms of Spark behavior, it would affect only the case when all arguments
> are binary. All other cases should remain unchanged.
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