Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/3433#issuecomment-68392344
Hmm, okay. It might be a little confusing to users if in one version it
does concatenation and in the other it is an `OR`. My other concern here is
that the new concatenation operator is implicitly doing casting internally
instead of actually casting its arguments to String. While this might be the
same now, I'll break if we ever have special string casts. Perhaps this
feature should be blocked on:
[SPARK-4867](https://issues.apache.org/jira/browse/SPARK-4867)?
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