remove unused code

sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala

@@ -40,8 +40,6 @@ trait Encoder[T] extends Serializable {
 }
 
 object Encoder {
-  import scala.reflect.runtime.universe._
-
   def BOOLEAN: Encoder[java.lang.Boolean] = ExpressionEncoder(flat = true)
   def BYTE: Encoder[java.lang.Byte] = ExpressionEncoder(flat = true)
   def SHORT: Encoder[java.lang.Short] = ExpressionEncoder(flat = true)
@@ -130,54 +128,4 @@ object Encoder {
       constructExpression,
       ClassTag.apply(cls))
   }
-
-  def typeTagOfTuple2[T1 : TypeTag, T2 : TypeTag]: TypeTag[(T1, T2)] = typeTag[(T1, T2)]
-
-  private def getTypeTag[T](c: Class[T]): TypeTag[T] = {
-    import scala.reflect.api
-
-    // val mirror = runtimeMirror(c.getClassLoader)
-    val mirror = rootMirror
-    val sym = mirror.staticClass(c.getName)
-    val tpe = sym.selfType
-    TypeTag(mirror, new api.TypeCreator {
-      def apply[U <: api.Universe with Singleton](m: api.Mirror[U]) =
-        if (m eq mirror) tpe.asInstanceOf[U # Type]
-        else throw new IllegalArgumentException(
-          s"Type tag defined in $mirror cannot be migrated to other mirrors.")
-    })
-  }
-
-  def forTuple[T1, T2](c1: Class[T1], c2: Class[T2]): Encoder[(T1, T2)] = {
-    implicit val typeTag1 = getTypeTag(c1)
-    implicit val typeTag2 = getTypeTag(c2)
-    ExpressionEncoder[(T1, T2)]()
-  }
-
-  def forTuple[T1, T2, T3](c1: Class[T1], c2: Class[T2], c3: Class[T3]): Encoder[(T1, T2, T3)] = {
-    implicit val typeTag1 = getTypeTag(c1)
-    implicit val typeTag2 = getTypeTag(c2)
-    implicit val typeTag3 = getTypeTag(c3)
-    ExpressionEncoder[(T1, T2, T3)]()
-  }
-
-  def forTuple[T1, T2, T3, T4](
-      c1: Class[T1], c2: Class[T2], c3: Class[T3], c4: Class[T4]): Encoder[(T1, T2, T3, T4)] = {
-    implicit val typeTag1 = getTypeTag(c1)
-    implicit val typeTag2 = getTypeTag(c2)
-    implicit val typeTag3 = getTypeTag(c3)
-    implicit val typeTag4 = getTypeTag(c4)
-    ExpressionEncoder[(T1, T2, T3, T4)]()
-  }
-
-  def forTuple[T1, T2, T3, T4, T5](
-      c1: Class[T1], c2: Class[T2], c3: Class[T3], c4: Class[T4], c5: Class[T5])
-    : Encoder[(T1, T2, T3, T4, T5)] = {
-    implicit val typeTag1 = getTypeTag(c1)
-    implicit val typeTag2 = getTypeTag(c2)
-    implicit val typeTag3 = getTypeTag(c3)
-    implicit val typeTag4 = getTypeTag(c4)
-    implicit val typeTag5 = getTypeTag(c5)
-    ExpressionEncoder[(T1, T2, T3, T4, T5)]()
-  }
 }

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala

@@ -17,19 +17,18 @@
 
 package org.apache.spark.sql.catalyst.encoders
 
-import org.apache.spark.sql.Encoder
-import org.apache.spark.sql.catalyst.analysis.{SimpleAnalyzer, UnresolvedExtractValue, UnresolvedAttribute}
-import org.apache.spark.sql.catalyst.plans.logical.{LocalRelation, Project}
-import org.apache.spark.util.Utils
-
 import scala.reflect.ClassTag
 import scala.reflect.runtime.universe.{typeTag, TypeTag}
 
+import org.apache.spark.util.Utils
+import org.apache.spark.sql.Encoder
+import org.apache.spark.sql.catalyst.analysis.{SimpleAnalyzer, UnresolvedExtractValue, UnresolvedAttribute}
+import org.apache.spark.sql.catalyst.plans.logical.{LocalRelation, Project}
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.expressions.codegen.{GenerateSafeProjection, GenerateUnsafeProjection}
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.ScalaReflection
-import org.apache.spark.sql.types.{StructField, DataType, ObjectType, StructType}
+import org.apache.spark.sql.types.{StructField, ObjectType, StructType}
 
 /**
  * A factory for constructing encoders that convert objects and primitves to and from the

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/package.scala

@@ -25,4 +25,3 @@ package object encoders {
     case _ => sys.error(s"Only expression encoders are supported today")
   }
 }
-

sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TypedAggregateExpression.scala

@@ -20,8 +20,9 @@ package org.apache.spark.sql.execution.aggregate
 import scala.language.existentials
 
 import org.apache.spark.Logging
+import org.apache.spark.sql.Encoder
 import org.apache.spark.sql.catalyst.InternalRow
-import org.apache.spark.sql.catalyst.encoders.{encoderFor, Encoder}
+import org.apache.spark.sql.catalyst.encoders.encoderFor
 import org.apache.spark.sql.catalyst.expressions.aggregate.ImperativeAggregate
 import org.apache.spark.sql.expressions.Aggregator
 import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder

sql/core/src/main/scala/org/apache/spark/sql/expressions/Aggregator.scala

@@ -17,7 +17,8 @@
 
 package org.apache.spark.sql.expressions
 
-import org.apache.spark.sql.catalyst.encoders.{encoderFor, Encoder}
+import org.apache.spark.sql.Encoder
+import org.apache.spark.sql.catalyst.encoders.encoderFor
 import org.apache.spark.sql.catalyst.expressions.aggregate.{Complete, AggregateExpression2}
 import org.apache.spark.sql.execution.aggregate.TypedAggregateExpression
 import org.apache.spark.sql.{Dataset, DataFrame, TypedColumn}

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

@@ -26,7 +26,7 @@ import scala.util.Try
 import org.apache.spark.annotation.Experimental
 import org.apache.spark.sql.catalyst.{SqlParser, ScalaReflection}
 import org.apache.spark.sql.catalyst.analysis.{UnresolvedFunction, Star}
-import org.apache.spark.sql.catalyst.encoders.{ExpressionEncoder, Encoder}
+import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.plans.logical.BroadcastHint
 import org.apache.spark.sql.types._

sql/core/src/test/scala/org/apache/spark/sql/DatasetAggregatorSuite.scala

@@ -17,13 +17,11 @@
 
 package org.apache.spark.sql
 
-import org.apache.spark.sql.catalyst.encoders.Encoder
-import org.apache.spark.sql.functions._
 
 import scala.language.postfixOps
 
 import org.apache.spark.sql.test.SharedSQLContext
-
+import org.apache.spark.sql.functions._
 import org.apache.spark.sql.expressions.Aggregator
 
 /** An `Aggregator` that adds up any numeric type returned by the given function. */