Remove removeColumn/updateColumn for now.

Author: rxin

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

@@ -17,10 +17,8 @@
 
 package org.apache.spark.sql
 
-import scala.collection.mutable.ArrayBuffer
 import scala.language.implicitConversions
 import scala.reflect.ClassTag
-import scala.collection.JavaConverters._
 import scala.collection.JavaConversions._
 
 import java.util.{ArrayList, List => JList}
@@ -444,10 +442,6 @@ class DataFrame protected[sql](
     select(Column("*"), col.as(colName))
   }
 
-  override def removeColumn(colName: String, col: Column): DataFrame = ???
-
-  override def updateColumn(colName: String, col: Column): DataFrame = ???
-
   /**
    * Return the first `n` rows.
    */

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

@@ -141,10 +141,6 @@ trait DataFrameSpecificApi {
   /////////////////////////////////////////////////////////////////////////////
   def addColumn(colName: String, col: Column): DataFrame
 
-  def removeColumn(colName: String, col: Column): DataFrame
-
-  def updateColumn(colName: String, col: Column): DataFrame
-
   /////////////////////////////////////////////////////////////////////////////
   // I/O and interaction with other frameworks
   /////////////////////////////////////////////////////////////////////////////