Fix scala style.

Author: viirya

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala

@@ -128,7 +128,7 @@ class CodeGenContext {
     case dt: DecimalType => decimalType
     case BinaryType => "byte[]"
     case StringType => stringType
-    case IntervalType =>  intervalType
+    case IntervalType => intervalType
     case _: StructType => "InternalRow"
     case _: ArrayType => s"scala.collection.Seq"
     case _: MapType => s"scala.collection.Map"