[SQL] Fix flaky SET test

Author: Michael Armbrust <[email protected]>

Closes #4480 from marmbrus/fixSetTests and squashes the following commits:

f2e501e [Michael Armbrust] [SQL] Fix flaky SET test

Author: marmbrus

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

@@ -541,8 +541,8 @@ class HiveQuerySuite extends HiveComparisonTest {
 
     sql(s"SET ${testKey + testKey}=${testVal + testVal}")
     assert(hiveconf.get(testKey + testKey, "") == testVal + testVal)
-    assertResult(Array(s"$testKey=$testVal", s"${testKey + testKey}=${testVal + testVal}")) {
-      sql(s"SET").collect().map(_.getString(0))
+    assertResult(Set(s"$testKey=$testVal", s"${testKey + testKey}=${testVal + testVal}")) {
+      sql(s"SET").collect().map(_.getString(0)).toSet
     }
     assertResult(Set(testKey -> testVal, (testKey + testKey) -> (testVal + testVal))) {
       collectResults(sql("SET -v"))