Fix build and switch to jdk8

* Fix Build

* more memory

* switch to jdk8

* old memory settings

.gitignore

@@ -5,6 +5,7 @@
 sbt/*.jar
 .idea
 .idea_modules
+*.iml
 
 # sbt specific
 build/*.jar

.travis.yml

@@ -1,5 +1,7 @@
 language: scala
 sudo: false
+jdk:
+  oraclejdk8
 cache:
   directories:
     - $HOME/.ivy2

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

@@ -16,7 +16,7 @@
 
 package com.databricks.spark.sql.perf
 
-import org.apache.spark.sql.SQLContext
+import org.apache.spark.sql.{Encoder, SQLContext}
 import org.apache.spark.sql.expressions.Aggregator
 
 case class Data(id: Long)
@@ -108,6 +108,10 @@ class DatasetPerformance extends Benchmark {
       b
     }
 
+    override def bufferEncoder = implicitly[Encoder[SumAndCount]]
+
+    override def outputEncoder = implicitly[Encoder[Double]]
+
     override def finish(reduction: SumAndCount): Double = reduction.sum.toDouble / reduction.count
 
     override def merge(b1: SumAndCount, b2: SumAndCount): SumAndCount = {

src/test/scala/com/databricks/spark/sql/perf/DatasetPerformanceSuite.scala

@@ -1,6 +1,5 @@
 package com.databricks.spark.sql.perf
 
-import com.databricks.spark.sql.perf.{Benchmark, DatasetPerformance}
 import org.apache.spark.sql.hive.test.TestHive
 import org.scalatest.FunSuite