Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19451#discussion_r147477134
--- Diff: sql/core/src/test/resources/sql-tests/inputs/except.sql ---
@@ -0,0 +1,57 @@
+-- Tests different scenarios of except operation
+create temporary view t1 as select * from values
+ ("one", 1),
+ ("two", 2),
+ ("three", 3),
+ ("one", NULL)
+ as t1(k, v);
+
+create temporary view t2 as select * from values
+ ("one", 1),
+ ("two", 22),
+ ("one", 5),
+ ("one", NULL),
+ (NULL, 5)
+ as t2(k, v);
+
+
+-- Except operation that will be replaced by left anti join
+SELECT * FROM t1 EXCEPT SELECT * FROM t2;
--- End diff --
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