[GitHub] [spark] HyukjinKwon commented on a change in pull request #25101: [SPARK-28277][SQL][PYTHON][TESTS] Convert and port 'except.sql' into UDF test base

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HyukjinKwon commented on a change in pull request #25101: [SPARK-28277][SQL][PYTHON][TESTS] Convert and port 'except.sql' into UDF test base
URL: https://github.com/apache/spark/pull/25101#discussion_r302332492
 
 

 ##########
 File path: sql/core/src/test/resources/sql-tests/inputs/udf/udf-except.sql
 ##########
 @@ -0,0 +1,58 @@
+-- This test file was converted from except.sql.
+-- 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;
 
 Review comment:
   Can we explicitly select fields with `udf`?

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