fix code style issues

Author: chenghao-intel

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

@@ -244,8 +244,8 @@ abstract class LeafExpression extends Expression with trees.LeafNode[Expression]
 }
 
 /**
- * Root class for rewritten single operand UDF expression. By default, we assume it produces Null if 
- * its operand is null. Exceptional case requires to update the optimization rule 
+ * Root class for rewritten single operand UDF expression. By default, we assume it produces Null 
+ * if its operand is null. Exceptional case requires to update the optimization rule 
  * at [[optimizer.ConstantFolding ConstantFolding]]
  */
 abstract class UnaryExpression extends Expression with trees.UnaryNode[Expression] {

sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUdfs.scala

@@ -214,7 +214,7 @@ private[hive] case class HiveGenericUdf(name: String, children: Seq[Expression])
 
   @transient
   protected lazy val returnInspector = function.initialize(argumentInspectors.toArray)
-	
+
   @transient
   protected lazy val isUDFDeterministic = {
     val udfType = function.getClass().getAnnotation(classOf[HiveUDFType])