fix test

Author: cloud-fan

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

@@ -965,14 +965,20 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
   }
 
   test("sanity test for SPARK-6618") {
-    (1 to 100).par.map { i =>
-      val tableName = s"SPARK_6618_table_$i"
-      sql(s"CREATE TABLE $tableName (col1 string)")
-      sessionState.catalog.lookupRelation(TableIdentifier(tableName))
-      table(tableName)
-      tables()
-      sql(s"DROP TABLE $tableName")
+    val threads: Seq[Thread] = (1 to 100).map { i =>
+      new Thread("test-thread-" + i) {
+        override def run(): Unit = {
+          val tableName = s"SPARK_6618_table_$i"
+          sql(s"CREATE TABLE $tableName (col1 string)")
+          sessionState.catalog.lookupRelation(TableIdentifier(tableName))
+          table(tableName)
+          tables()
+          sql(s"DROP TABLE $tableName")
+        }
+      }
     }
+    threads.foreach(_.start())
+    threads.foreach(_.join(10000))
   }
 
   test("SPARK-5203 union with different decimal precision") {