Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31300741
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -171,29 +171,53 @@ case class Or(left: Expression, right: Expression)
abstract class BinaryComparison extends BinaryExpression with Predicate {
self: Product =>
-}
-case class EqualTo(left: Expression, right: Expression) extends
BinaryComparison {
- override def symbol: String = "="
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (left.dataType != right.dataType) {
+ TypeCheckResult.fail(
+ s"differing types in BinaryComparison, ${left.dataType} !=
${right.dataType}")
--- End diff --
we need more specific error messages than BinaryComparison.
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