Update a comment.

Author: concretevitamin

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

@@ -138,7 +138,9 @@ abstract class HiveComparisonTest
 
     val orderedAnswer = hiveQuery.logical match {
       // Clean out non-deterministic time schema info.
-      case _: SetCommand => Seq("0") // FIXME: respect the semantics of set commands?
+      // Hack: Hive simply prints the result of a SET command to screen,
+      // and does not return it as a query answer.
+      case _: SetCommand => Seq("0")
       case _: NativeCommand => answer.filterNot(nonDeterministicLine).filterNot(_ == "")
       case _: ExplainCommand => answer
       case plan => if (isSorted(plan)) answer else answer.sorted