Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/6405#issuecomment-105983848
Hi @rxin, now we define how to check input types at concrete expressions
and define how to do type coercion at `HiveTypeCoercion`, is this the right
logic?
Hi @marmbrus , according to [this line of
code](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L220),
is `BinaryExpression` designed to have 2 equal type children? IMO
`BinaryExpression` should not have natural type constraint.
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