Undoing changes not needed for this PR

Author: AndreSchumacher

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/types/dataTypes.scala

@@ -19,13 +19,10 @@ package org.apache.spark.sql.catalyst.types
 
 import java.sql.Timestamp
 
-import scala.reflect.ClassTag
-import scala.reflect.runtime.universe.{typeTag, TypeTag, runtimeMirror}
+import scala.reflect.runtime.universe.{typeTag, TypeTag}
 
 import org.apache.spark.sql.catalyst.expressions.Expression
 
-import org.apache.spark.util.Utils
-
 abstract class DataType {
   /** Matches any expression that evaluates to this DataType */
   def unapply(a: Expression): Boolean = a match {
@@ -40,11 +37,6 @@ abstract class NativeType extends DataType {
   type JvmType
   @transient val tag: TypeTag[JvmType]
   val ordering: Ordering[JvmType]
-
-  @transient val classTag = {
-  val mirror = runtimeMirror(Utils.getSparkClassLoader)
-    ClassTag[JvmType](mirror.runtimeClass(tag.tpe))
-  }
 }
 
 case object StringType extends NativeType {

sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala

@@ -141,6 +141,11 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
       case logical.InsertIntoTable(table: ParquetRelation, partition, child, overwrite) =>
         InsertIntoParquetTable(table, planLater(child), overwrite)(sparkContext) :: Nil
       case PhysicalOperation(projectList, filters, relation: ParquetRelation) =>
+        // Note: we do not actually remove the filters that were pushed down to Parquet from
+        // the plan, in case that some of the predicates cannot be evaluated there because
+        // they contain complex operations, such as CASTs.
+        // TODO: rethink whether conjuntions that are handed down to Parquet should be removed
+        // from the list of higher-level filters.
           pruneFilterProject(
             projectList,
             filters,

sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetRelation.scala

@@ -33,11 +33,9 @@ import parquet.schema.PrimitiveType.{PrimitiveTypeName => ParquetPrimitiveTypeNa
 import parquet.schema.Type.Repetition
 
 import org.apache.spark.sql.catalyst.analysis.{MultiInstanceRelation, UnresolvedException}
-import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeReference, Row}
 import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, LeafNode}
 import org.apache.spark.sql.catalyst.types._
-import org.apache.spark.sql.catalyst.types.ArrayType
-import org.apache.spark.sql.catalyst.expressions.AttributeReference
 
 // Implicits
 import scala.collection.JavaConversions._