yaooqinn commented on a change in pull request #26412: [SPARK-29774][SQL] Date 
and Timestamp type +/- null should be null as Postgres
URL: https://github.com/apache/spark/pull/26412#discussion_r353588331
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ##########
 @@ -185,16 +186,17 @@ case class DateAdd(startDate: Expression, days: 
Expression)
   """,
   since = "1.5.0")
 case class DateSub(startDate: Expression, days: Expression)
-  extends BinaryExpression with ImplicitCastInputTypes {
+  extends BinaryExpression with ExpectsInputTypes {
   override def left: Expression = startDate
   override def right: Expression = days
 
-  override def inputTypes: Seq[AbstractDataType] = Seq(DateType, IntegerType)
+  override def inputTypes: Seq[AbstractDataType] =
+    Seq(DateType, TypeCollection(IntegerType, ShortType, ByteType))
 
   override def dataType: DataType = DateType
 
   override def nullSafeEval(start: Any, d: Any): Any = {
-    start.asInstanceOf[Int] - d.asInstanceOf[Int]
+    start.asInstanceOf[Int] - d.asInstanceOf[Number].intValue()
 
 Review comment:
   done

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