For comment.

Author: viirya

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

@@ -17,6 +17,7 @@
 
 package org.apache.spark.sql.catalyst.expressions
 
+import java.math.{BigDecimal => JavaBigDecimal}
 import java.sql.{Date, Timestamp}
 import java.text.{DateFormat, SimpleDateFormat}
 
@@ -323,7 +324,7 @@ case class Cast(child: Expression, dataType: DataType) extends UnaryExpression w
   private[this] def castToDecimal(from: DataType, target: DecimalType): Any => Any = from match {
     case StringType =>
       buildCast[UTF8String](_, s => try {
-        changePrecision(Decimal(new java.math.BigDecimal(s.toString)), target)
+        changePrecision(Decimal(new JavaBigDecimal(s.toString)), target)
       } catch {
         case _: NumberFormatException => null
       })