update SQLQuerySuite on master branch

[SPARK-2234][SQL]Spark SQL basicOperators add Except operator #1151

Author: YanjieGao

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

@@ -267,3 +267,17 @@ class SQLQuerySuite extends QueryTest {
         (4, "D")))
   }
 }
+
+test("EXCEPT") {
+
+    checkAnswer(
+      sql("SELECT * FROM lowerCaseData EXCEPT SELECT * FROM upperCaseData "),
+      (1, "a") ::
+      (2, "b") ::
+      (3, "c") ::
+      (4, "d") :: Nil)
+    checkAnswer(
+      sql("SELECT * FROM lowerCaseData EXCEPT SELECT * FROM lowerCaseData "), Nil)
+    checkAnswer(
+      sql("SELECT * FROM upperCaseData EXCEPT SELECT * FROM upperCaseData "), Nil)
+  }