[SPARK-9418][SQL] Use sort-merge join as the default shuffle join.

Sort-merge join is more robust in Spark since sorting can be made using the Tungsten sort operator.

Author: Reynold Xin <rxin@databricks.com>

Closes #7733 from rxin/smj and squashes the following commits:

61e4d34 [Reynold Xin] Fixed test case.
5ffd731 [Reynold Xin] Fixed JoinSuite.
a137dc0 [Reynold Xin] [SPARK-9418][SQL] Use sort-merge join as the default shuffle join.

1 files changed, 4 insertions, 4 deletions

diff --git a/sql/hive/compatibility/src/test/scala/org/apache/spark/sql/hive/execution/SortMergeCompatibilitySuite.scala b/sql/hive/compatibility/src/test/scala/org/apache/spark/sql/hive/execution/HashJoinCompatibilitySuite.scala
index 1fe4fe9629..1a5ba20404 100644
--- a/sql/hive/compatibility/src/test/scala/org/apache/spark/sql/hive/execution/SortMergeCompatibilitySuite.scala
+++ b/sql/hive/compatibility/src/test/scala/org/apache/spark/sql/hive/execution/HashJoinCompatibilitySuite.scala
@@ -23,16 +23,16 @@ import org.apache.spark.sql.SQLConf
 import org.apache.spark.sql.hive.test.TestHive
 
 /**
- * Runs the test cases that are included in the hive distribution with sort merge join is true.
+ * Runs the test cases that are included in the hive distribution with hash joins.
  */
-class SortMergeCompatibilitySuite extends HiveCompatibilitySuite {
+class HashJoinCompatibilitySuite extends HiveCompatibilitySuite {
   override def beforeAll() {
     super.beforeAll()
-    TestHive.setConf(SQLConf.SORTMERGE_JOIN, true)
+    TestHive.setConf(SQLConf.SORTMERGE_JOIN, false)
   }
 
   override def afterAll() {
-    TestHive.setConf(SQLConf.SORTMERGE_JOIN, false)
+    TestHive.setConf(SQLConf.SORTMERGE_JOIN, true)
     super.afterAll()
   }