Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/15956#discussion_r88845470 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala --- @@ -388,6 +388,21 @@ abstract class BinaryComparison extends BinaryOperator with Predicate { defineCodeGen(ctx, ev, (c1, c2) => s"${ctx.genComp(left.dataType, c1, c2)} $symbol 0") } } + + override def inputType: AbstractDataType = AnyDataType --- End diff -- We need this to satisfy `BinaryOperator`, the type checking logic is defined by both `BinaryOperator` and `checkInputDataTypes` here. Shall we make `BinaryComparison` not extends `BinaryOperator` and duplicate its type checking logic here?
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