Make it easier to write benchmarks in notebooks

Author: Michael Armbrust <michael@databricks.com>

Closes #19 from marmbrus/notebookTests.

src/main/scala/com/databricks/spark/sql/perf/Benchmark.scala

@@ -303,7 +303,10 @@ abstract class Benchmark(
   import reflect.runtime._
   import universe._
 
+  @transient
   private val runtimeMirror = universe.runtimeMirror(getClass.getClassLoader)
+
+  @transient
   val myType = runtimeMirror.classSymbol(getClass).toType
 
   def singleTables =
@@ -320,6 +323,7 @@ abstract class Benchmark(
       .filter(_.asMethod.returnType =:= typeOf[Seq[Table]])
       .flatMap(method => runtimeMirror.reflect(this).reflectMethod(method).apply().asInstanceOf[Seq[Table]])
 
+  @transient
   lazy val allTables: Seq[Table] = (singleTables ++ groupedTables).toSeq
 
   def singleQueries =
@@ -336,6 +340,7 @@ abstract class Benchmark(
       .filter(_.asMethod.returnType =:= typeOf[Seq[Query]])
       .flatMap(method => runtimeMirror.reflect(this).reflectMethod(method).apply().asInstanceOf[Seq[Query]])
 
+  @transient
   lazy val allQueries = (singleQueries ++ groupedQueries).toSeq
 
   def html: String = {
@@ -368,8 +373,8 @@ abstract class Benchmark(
      """.stripMargin
   }
 
-  trait ExecutionMode
-  object ExecutionMode {
+  trait ExecutionMode extends Serializable
+  case object ExecutionMode {
     // Benchmark run by collecting queries results  (e.g. rdd.collect())
     case object CollectResults extends ExecutionMode {
       override def toString: String = "collect"
@@ -393,7 +398,7 @@ abstract class Benchmark(
   }
 
   /** Factory object for benchmark queries. */
-  object Query {
+  case object Query {
     def apply(
         name: String,
         sqlText: String,
@@ -414,9 +419,9 @@ abstract class Benchmark(
   class Query(
       val name: String,
       buildDataFrame: => DataFrame,
-      val description: String,
-      val sqlText: Option[String],
-      val executionMode: ExecutionMode) {
+      val description: String = "",
+      val sqlText: Option[String] = None,
+      val executionMode: ExecutionMode = ExecutionMode.ForeachResults) extends Serializable {
 
     override def toString =
       s"""