diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
index 45e8830b9ba76..5689816d022a2 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
@@ -19,29 +19,24 @@ package org.apache.spark.sql.catalyst.plans.logical
 
 import org.apache.spark.sql.catalyst.errors.TreeNodeException
 import org.apache.spark.sql.catalyst.expressions._
-import org.apache.spark.sql.catalyst.planning.SQLConf
 import org.apache.spark.sql.catalyst.plans.QueryPlan
 import org.apache.spark.sql.catalyst.types.StructType
 import org.apache.spark.sql.catalyst.trees
 
-abstract class LogicalPlan extends QueryPlan[LogicalPlan] with SQLConf {
+abstract class LogicalPlan extends QueryPlan[LogicalPlan] {
   self: Product =>
 
   // TODO: make a case class?
+  /**
+   * Estimates of various statistics.  The default estimation logic simply sums up the corresponding
+   * statistic produced by the children.  To override this behavior, override `statistics` and
+   * assign it a overriden version of `Statistics`.
+   */
   protected class Statistics {
     lazy val childrenStats = children.map(_.statistics)
-
     lazy val numTuples: Long = childrenStats.map(_.numTuples).sum
-
-    lazy val sizeInBytes: Long = {
-      val sum = childrenStats.map(_.sizeInBytes).sum
-      if (sum == 0) statsDefaultSizeInBytes else sum
-    }
+    lazy val sizeInBytes: Long = childrenStats.map(_.sizeInBytes).sum
   }
-
-  /**
-   * Estimates of various statistics.
-   */
   lazy val statistics: Statistics = new Statistics
 
   /**
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/SQLConf.scala b/sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala
similarity index 97%
rename from sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/SQLConf.scala
rename to sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala
index c78c2439c2533..234cb2a445b49 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/SQLConf.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala
@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package org.apache.spark.sql.catalyst.planning
+package org.apache.spark.sql
 
 import java.util.Properties
 
@@ -40,8 +40,8 @@ private object SQLConf {
 trait SQLConf {
   import SQLConf._
 
-  import SQLConf._
-  protected[spark] val settings = confSettings
+  import org.apache.spark.sql.SQLConf._
+  @transient protected[spark] val settings = confSettings
 
   /** ************************ Spark SQL Params/Hints ******************* */
   // TODO: refactor so that these hints accessors don't pollute the name space of SQLContext?
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala b/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala
index d3718c55543fb..1a8357f31f5dc 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala
@@ -17,7 +17,6 @@
 
 package org.apache.spark.sql
 
-
 import scala.language.implicitConversions
 import scala.reflect.runtime.universe.TypeTag
 
@@ -30,7 +29,6 @@ import org.apache.spark.sql.catalyst.analysis._
 import org.apache.spark.sql.catalyst.dsl.ExpressionConversions
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.optimizer.Optimizer
-import org.apache.spark.sql.catalyst.planning.SQLConf
 import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
 import org.apache.spark.sql.catalyst.rules.RuleExecutor
 import org.apache.spark.sql.catalyst.types._
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala
index b07f0df7de4b9..7e6454d9c87f4 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala
@@ -19,7 +19,7 @@ package org.apache.spark.sql.execution
 
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{Logging, Row}
+import org.apache.spark.sql.{Logging, Row, SQLConf}
 import org.apache.spark.sql.catalyst.trees
 import org.apache.spark.sql.catalyst.analysis.MultiInstanceRelation
 import org.apache.spark.sql.catalyst.expressions.GenericRow
@@ -67,7 +67,7 @@ abstract class SparkPlan extends QueryPlan[SparkPlan] with Logging {
  */
 @DeveloperApi
 case class SparkLogicalPlan(alreadyPlanned: SparkPlan)
-  extends LogicalPlan with MultiInstanceRelation {
+  extends LogicalPlan with MultiInstanceRelation with SQLConf {
 
   def output = alreadyPlanned.output
   override def references = Set.empty
@@ -80,6 +80,19 @@ case class SparkLogicalPlan(alreadyPlanned: SparkPlan)
         case _ => sys.error("Multiple instance of the same relation detected.")
       }).asInstanceOf[this.type]
   }
+
+  override lazy val statistics = new Statistics {
+    // If this is wrapping around ExistingRdd and no reasonable estimation logic is implemented,
+    // return a default value.
+    override lazy val sizeInBytes: Long = {
+      val defaultSum = childrenStats.map(_.sizeInBytes).sum
+      alreadyPlanned match {
+        case e: ExistingRdd if defaultSum == 0 => statsDefaultSizeInBytes
+        case _ => defaultSum
+      }
+    }
+  }
+
 }
 
 private[sql] trait LeafNode extends SparkPlan with trees.LeafNode[SparkPlan] {