HyukjinKwon commented on a change in pull request #25119: 
[SPARK-28283][SQL][PYTHON][TESTS] Convert and port 'intersect-all.sql' into UDF 
test base
URL: https://github.com/apache/spark/pull/25119#discussion_r304729633
 
 

 ##########
 File path: 
sql/core/src/test/resources/sql-tests/inputs/udf/udf-intersect-all.sql
 ##########
 @@ -0,0 +1,164 @@
+-- This test file was converted from intersect-all.sql.
+-- Note that currently registered UDF returns a string. So there are some 
differences, for instance
+-- in string cast within UDF in Scala and Python.
+
+CREATE TEMPORARY VIEW tab1 AS SELECT * FROM VALUES
+    (1, 2), 
+    (1, 2),
+    (1, 3),
+    (1, 3),
+    (2, 3),
+    (null, null),
+    (null, null)
+    AS tab1(k, v);
+CREATE TEMPORARY VIEW tab2 AS SELECT * FROM VALUES
+    (1, 2), 
+    (1, 2), 
+    (2, 3),
+    (3, 4),
+    (null, null),
+    (null, null)
+    AS tab2(k, v);
+
+-- Basic INTERSECT ALL
+SELECT * FROM tab1
 
 Review comment:
   I think my comments I left at of your PRs are applied here too. Let's list 
up cols

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