Fix default hive result for set commands in HiveComparisonTest.

Author: concretevitamin

sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala

@@ -282,7 +282,7 @@ class SQLContext(@transient val sparkContext: SparkContext)
       logical match {
         case SetCommand(key, value) =>
           sqlConf.set(key, value)
-          emptyResult // TODO: should this return something else?
+          emptyResult // TODO: should this return something else? Single row consisting of one 0?
         case _ => executedPlan.execute()
       }
     }

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveContext.scala

@@ -258,7 +258,6 @@ class HiveContext(sc: SparkContext) extends SQLContext(sc) {
 
       analyzed match {
         case SetCommand(key, value) =>
-          logger.debug("inside Hive's toRdd -- matched SetCommand")
           // Record the set command inside SQLConf, as well as have Hive execute it.
           sqlConf.set(key, value)
           processCmd(s"set $key=$value")

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveComparisonTest.scala

@@ -138,6 +138,7 @@ abstract class HiveComparisonTest
 
     val orderedAnswer = hiveQuery.logical match {
       // Clean out non-deterministic time schema info.
+      case _: SetCommand => Seq("0")
       case _: NativeCommand => answer.filterNot(nonDeterministicLine).filterNot(_ == "")
       case _: ExplainCommand => answer
       case plan => if (isSorted(plan)) answer else answer.sorted