[SPARK-15011][SQL] Re-enable 'analyze MetastoreRelations' in hive StatisticsSuite

## What changes were proposed in this pull request?
This test re-enables the `analyze MetastoreRelations` in `org.apache.spark.sql.hive.StatisticsSuite`.

The flakiness of this test was traced back to a shared configuration option, `hive.exec.compress.output`, in `TestHive`. This property was set to `true` by the `HiveCompatibilitySuite`. I have added configuration resetting logic to `HiveComparisonTest`, in order to prevent such a thing from happening again.

## How was this patch tested?
Is a test.

Author: Herman van Hovell <hvanhovell@databricks.com>
Author: Herman van Hovell <hvanhovell@questtec.nl>

Closes #13498 from hvanhovell/SPARK-15011.

sql/hive/src/test/scala/org/apache/spark/sql/hive/StatisticsSuite.scala

@@ -21,7 +21,7 @@ import java.io.{File, PrintWriter}
 
 import scala.reflect.ClassTag
 
-import org.apache.spark.sql.{QueryTest, Row}
+import org.apache.spark.sql.{AnalysisException, QueryTest, Row}
 import org.apache.spark.sql.catalyst.TableIdentifier
 import org.apache.spark.sql.execution.command.AnalyzeTableCommand
 import org.apache.spark.sql.execution.joins._
@@ -115,7 +115,7 @@ class StatisticsSuite extends QueryTest with TestHiveSingleton with SQLTestUtils
     }
   }
 
-  ignore("analyze MetastoreRelations") {
+  test("analyze MetastoreRelations") {
     def queryTotalSize(tableName: String): BigInt =
       spark.sessionState.catalog.lookupRelation(TableIdentifier(tableName)).statistics.sizeInBytes
 
@@ -155,14 +155,13 @@ class StatisticsSuite extends QueryTest with TestHiveSingleton with SQLTestUtils
 
     sql("ANALYZE TABLE analyzeTable_part COMPUTE STATISTICS noscan")
 
-    // This seems to be flaky.
-    // assert(queryTotalSize("analyzeTable_part") === BigInt(17436))
+    assert(queryTotalSize("analyzeTable_part") === BigInt(17436))
 
     sql("DROP TABLE analyzeTable_part").collect()
 
     // Try to analyze a temp table
     sql("""SELECT * FROM src""").createOrReplaceTempView("tempTable")
-    intercept[UnsupportedOperationException] {
+    intercept[AnalysisException] {
       sql("ANALYZE TABLE tempTable COMPUTE STATISTICS")
     }
     spark.sessionState.catalog.dropTable(

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

@@ -19,6 +19,7 @@ package org.apache.spark.sql.hive.execution
 
 import java.io._
 import java.nio.charset.StandardCharsets
+import java.util
 
 import scala.util.control.NonFatal
 
@@ -497,6 +498,8 @@ abstract class HiveComparisonTest
         }
       }
 
+      val savedSettings = new util.HashMap[String, String]
+      savedSettings.putAll(TestHive.conf.settings)
       try {
         try {
           if (tryWithoutResettingFirst && canSpeculativelyTryWithoutReset) {
@@ -515,6 +518,9 @@ abstract class HiveComparisonTest
         }
       } catch {
         case tf: org.scalatest.exceptions.TestFailedException => throw tf
+      } finally {
+        TestHive.conf.settings.clear()
+        TestHive.conf.settings.putAll(savedSettings)
       }
     }
   }