Fernando Pereira created SPARK-22771:
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Summary: 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 chould remain unchanged.
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