Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/7420#discussion_r34685514
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -353,7 +353,7 @@ abstract class BinaryExpression extends Expression with
trees.BinaryNode[Express
* 2. Two inputs are expected to the be same type. If the two inputs have
different types,
* the analyzer will find the tightest common type and do the proper
type casting.
*/
-abstract class BinaryOperator extends BinaryExpression with
ExpectsInputTypes {
--- End diff --
We have a rule in `HiveTypeCoercion` for `BinaryOperator`, extending
`ExpectsInputTypes` only help us generate error message here. I think it's
better to generate a different error message for `BinaryOperator`.
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