Removes WriteToFile

Author: liancheng

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala

@@ -186,12 +186,6 @@ case class WithWindowDefinition(
   override def output: Seq[Attribute] = child.output
 }
 
-case class WriteToFile(
-    path: String,
-    child: LogicalPlan) extends UnaryNode {
-  override def output: Seq[Attribute] = child.output
-}
-
 /**
  * @param order  The ordering expressions
  * @param global True means global sorting apply for entire data set,

sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala

@@ -139,8 +139,7 @@ class DataFrame private[sql](
     // happen right away to let these side effects take place eagerly.
     case _: Command |
          _: InsertIntoTable |
-         _: CreateTableUsingAsSelect |
-         _: WriteToFile =>
+         _: CreateTableUsingAsSelect =>
       LogicalRDD(queryExecution.analyzed.output, queryExecution.toRdd)(sqlContext)
     case _ =>
       queryExecution.analyzed