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Date: Thu, 14 Dec 2017 00:46:19 +0000 (UTC)
From: "Xiao Li (JIRA)" <jira@apache.org>
To: issues@spark.apache.org
Message-ID: <JIRA.13124615.1513158226000.453835.1513212379876@Atlassian.JIRA>
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Subject: [jira] [Commented] (SPARK-22771) SQL concat for binary
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archived-at: Thu, 14 Dec 2017 00:46:27 -0000


    [ https://issues.apache.org/jira/browse/SPARK-22771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290160#comment-16290160 ] 

Xiao Li commented on SPARK-22771:
---------------------------------

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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