[SPARK-2866][SQL] Support attributes in ORDER BY that aren't in SELECT

Minor refactoring to allow resolution either using a nodes input or output.

Author: Michael Armbrust <michael@databricks.com>

Closes #1795 from marmbrus/ordering and squashes the following commits:

237f580 [Michael Armbrust] style
74d833b [Michael Armbrust] newline
705d963 [Michael Armbrust] Add a rule for resolving ORDER BY expressions that reference attributes not present in the SELECT clause.
82cabda [Michael Armbrust] Generalize attribute resolution.

1 files changed, 50 insertions, 0 deletions

diff --git a/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala b/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala
new file mode 100644
index 0000000000..635a9fb0d5
--- /dev/null
+++ b/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.hive.execution
+
+import scala.reflect.ClassTag
+
+import org.apache.spark.sql.{SQLConf, QueryTest}
+import org.apache.spark.sql.execution.{BroadcastHashJoin, ShuffledHashJoin}
+import org.apache.spark.sql.hive.test.TestHive
+import org.apache.spark.sql.hive.test.TestHive._
+
+/**
+ * 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
+ * valid, but Hive currently cannot execute it.
+ */
+class SQLQuerySuite extends QueryTest {
+  test("ordering not in select") {
+    checkAnswer(
+      sql("SELECT key FROM src ORDER BY value"),
+      sql("SELECT key FROM (SELECT key, value FROM src ORDER BY value) a").collect().toSeq)
+  }
+
+  test("ordering not in agg") {
+    checkAnswer(
+      sql("SELECT key FROM src GROUP BY key, value ORDER BY value"),
+      sql("""
+        SELECT key
+        FROM (
+          SELECT key, value
+          FROM src
+          GROUP BY key, value
+          ORDER BY value) a""").collect().toSeq)
+  }
+}