rebase & inputTypes update

Author: yjshen

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/math.scala

@@ -543,7 +543,7 @@ case class Round(child: Expression, scale: Expression) extends Expression with E
 
   override def inputTypes: Seq[AbstractDataType] = Seq(
     // rely on precedence to implicit cast String into Double
-    TypeCollection(DoubleType, FloatType, LongType, IntegerType, ShortType, ByteType),
+    TypeCollection(DecimalType, DoubleType, FloatType, LongType, IntegerType, ShortType, ByteType),
     TypeCollection(LongType, IntegerType, ShortType, ByteType))
 
   override def checkInputDataTypes(): TypeCheckResult = {