[SPARK-19990][TEST] Use the database after Hive's current Database is…

… dropped

### What changes were proposed in this pull request?
This PR is to fix the following test failure in maven and the PR apache#15363.

> org.apache.spark.sql.hive.orc.OrcSourceSuite SPARK-19459/SPARK-18220: read char/varchar column written by Hive

The[ test history](https://spark-tests.appspot.com/test-details?suite_name=org.apache.spark.sql.hive.orc.OrcSourceSuite&test_name=SPARK-19459%2FSPARK-18220%3A+read+char%2Fvarchar+column+written+by+Hive) shows all the maven builds failed this test case with the same error message.

```
FAILED: SemanticException [Error 10072]: Database does not exist: db2

      org.apache.spark.sql.execution.QueryExecutionException: FAILED: SemanticException [Error 10072]: Database does not exist: db2
      at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$runHive$1.apply(HiveClientImpl.scala:637)
      at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$runHive$1.apply(HiveClientImpl.scala:621)
      at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$withHiveState$1.apply(HiveClientImpl.scala:288)
      at org.apache.spark.sql.hive.client.HiveClientImpl.liftedTree1$1(HiveClientImpl.scala:229)
      at org.apache.spark.sql.hive.client.HiveClientImpl.retryLocked(HiveClientImpl.scala:228)
      at org.apache.spark.sql.hive.client.HiveClientImpl.withHiveState(HiveClientImpl.scala:271)
      at org.apache.spark.sql.hive.client.HiveClientImpl.runHive(HiveClientImpl.scala:621)
      at org.apache.spark.sql.hive.client.HiveClientImpl.runSqlHive(HiveClientImpl.scala:611)
      at org.apache.spark.sql.hive.orc.OrcSuite$$anonfun$7.apply$mcV$sp(OrcSourceSuite.scala:160)
      at org.apache.spark.sql.hive.orc.OrcSuite$$anonfun$7.apply(OrcSourceSuite.scala:155)
      at org.apache.spark.sql.hive.orc.OrcSuite$$anonfun$7.apply(OrcSourceSuite.scala:155)
      at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
      at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
      at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
      at org.scalatest.Transformer.apply(Transformer.scala:22)
      at org.scalatest.Transformer.apply(Transformer.scala:20)
      at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
      at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:68)
      at org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
      at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
```

### How was this patch tested?
N/A

Author: Xiao Li <gatorsmile@gmail.com>

Closes apache#17344 from gatorsmile/testtest.

sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcSourceSuite.scala

@@ -157,19 +157,21 @@ abstract class OrcSuite extends QueryTest with TestHiveSingleton with BeforeAndA
     val location = Utils.createTempDir()
     val uri = location.toURI
     try {
+      hiveClient.runSqlHive("USE default")
       hiveClient.runSqlHive(
         """
-           |CREATE EXTERNAL TABLE hive_orc(
-           |  a STRING,
-           |  b CHAR(10),
-           |  c VARCHAR(10),
-           |  d ARRAY<CHAR(3)>)
-           |STORED AS orc""".stripMargin)
+          |CREATE EXTERNAL TABLE hive_orc(
+          |  a STRING,
+          |  b CHAR(10),
+          |  c VARCHAR(10),
+          |  d ARRAY<CHAR(3)>)
+          |STORED AS orc""".stripMargin)
       // Hive throws an exception if I assign the location in the create table statement.
       hiveClient.runSqlHive(
         s"ALTER TABLE hive_orc SET LOCATION '$uri'")
       hiveClient.runSqlHive(
-        """INSERT INTO TABLE hive_orc
+        """
+          |INSERT INTO TABLE hive_orc
           |SELECT 'a', 'b', 'c', ARRAY(CAST('d' AS CHAR(3)))
           |FROM (SELECT 1) t""".stripMargin)