fix the bug in unittest

Author: chenghao-intel

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala

@@ -198,6 +198,11 @@ abstract class LogicalPlan extends QueryPlan[LogicalPlan] with Logging {
           resolveGetField(e, fieldName, resolver)
         }
 
+        // TODO the alias name is quite tricky to me, set it to _col1, _col2.. ?
+        // Set it as original attribute name like "a.b.c" seems still confusing,
+        // and we may never reference this column by its name (with "."), except
+        // people write SQL like: SELECT a.b.c as newCol FROM nestedTable, which
+        // explicitly specifying the alias name for the output column
         Some(Alias(fieldExprs, name)())
 
       // No matches.

sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala

@@ -68,7 +68,7 @@ class SQLQuerySuite extends QueryTest with BeforeAndAfterAll {
         """
           |select attribute, sum(cnt)
           |from (
-          |  select nested.attribute, count(*) as cnt
+          |  select nested.attribute as attribute, count(*) as cnt
           |  from rows
           |  group by nested.attribute) a
           |group by attribute

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

@@ -48,6 +48,15 @@ class SQLQuerySuite extends QueryTest {
       Row(1) :: Row(2) :: Row(3) :: Nil)
   }
 
+  test("SPARK-6145 insert into table by selecting data from a nested table") {
+    jsonRDD(sparkContext.parallelize(
+      """{"a": {"a": {"a": 1}}, "c": 1}""" :: Nil)).registerTempTable("nestedOrder")
+
+    sql("CREATE TABLE gen_tmp_6145 (key Int)")
+    sql("INSERT INTO table gen_tmp_6145 SELECT a.a.a from nestedOrder")
+    sql("DROP TABLE gen_tmp_6145")
+  }
+
   test("SPARK-4512 Fix attribute reference resolution error when using SORT BY") {
     checkAnswer(
       sql("SELECT * FROM (SELECT key + key AS a FROM src SORT BY value) t ORDER BY t.a"),