add regression test for doubly nested data

Author: marmbrus

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

@@ -24,6 +24,10 @@ import org.apache.spark.sql.execution.{BroadcastHashJoin, ShuffledHashJoin}
 import org.apache.spark.sql.hive.test.TestHive
 import org.apache.spark.sql.hive.test.TestHive._
 
+case class Nested1(f1: Nested2)
+case class Nested2(f2: Nested3)
+case class Nested3(f3: Int)
+
 /**
  * A collection of hive query tests where we generate the answers ourselves instead of depending on
  * Hive to generate them (in contrast to HiveQuerySuite).  Often this is because the query is
@@ -47,4 +51,11 @@ class SQLQuerySuite extends QueryTest {
           GROUP BY key, value
           ORDER BY value) a""").collect().toSeq)
   }
+
+  test("double nested data") {
+    sparkContext.parallelize(Nested1(Nested2(Nested3(1))) :: Nil).registerTempTable("nested")
+    checkAnswer(
+      sql("SELECT f1.f2.f3 FROM nested"),
+      1)
+  }
 }