Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/1151#discussion_r14529947
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
---
@@ -371,6 +371,19 @@ class SQLQuerySuite extends QueryTest {
(3, null)))
}
+ 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)
+ }
test("SET commands semantics using sql()") {
--- End diff --
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