Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/6723#issuecomment-110407441
cc @rxin , according to
[here](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala#L180)
and
[here](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L234),
do we require `BinaryExpression` to have 2 equal-type children? If so, I think
we should add java doc of `BinaryExpression` to say that, or we should create a
subclass of `BinaryExpression` which has equal-type children.
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