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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