should be it

external/duckdb/test/sql/subquery/test_neumann.test

@@ -0,0 +1,50 @@
+# name: test/sql/subquery/test_neumann.test
+# description: Test subqueries from the paper 'Unnesting Arbitrary Subqueries'
+# group: [subquery]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TABLE students(id INTEGER, name VARCHAR, major VARCHAR, year INTEGER)
+
+statement ok
+CREATE TABLE exams(sid INTEGER, course VARCHAR, curriculum VARCHAR, grade INTEGER, year INTEGER)
+
+statement ok
+INSERT INTO students VALUES (1, 'Mark', 'CS', 2017)
+
+statement ok
+INSERT INTO students VALUES (2, 'Dirk', 'CS', 2017)
+
+statement ok
+INSERT INTO exams VALUES (1, 'Database Systems', 'CS', 10, 2015)
+
+statement ok
+INSERT INTO exams VALUES (1, 'Graphics', 'CS', 9, 2016)
+
+statement ok
+INSERT INTO exams VALUES (2, 'Database Systems', 'CS', 7, 2015)
+
+statement ok
+INSERT INTO exams VALUES (2, 'Graphics', 'CS', 7, 2016)
+
+query TTI
+SELECT s.name, e.course, e.grade FROM students s, exams e WHERE s.id=e.sid AND e.grade=(SELECT MAX(e2.grade) FROM exams e2 WHERE s.id=e2.sid) ORDER BY name, course;
+----
+Dirk	Database Systems	7
+Dirk	Graphics	7
+Mark	Database Systems	10
+
+query TTI
+SELECT s.name, e.course, e.grade FROM students s, exams e WHERE s.id=e.sid AND (s.major = 'CS' OR s.major = 'Games Eng') AND e.grade <= (SELECT AVG(e2.grade) - 1 FROM exams e2 WHERE s.id=e2.sid OR (e2.curriculum=s.major AND s.year>=e2.year)) ORDER BY name, course;
+----
+Dirk	Database Systems	7
+Dirk	Graphics	7
+
+query TT
+SELECT name, major FROM students s WHERE EXISTS(SELECT * FROM exams e WHERE e.sid=s.id AND grade=10) OR s.name='Dirk' ORDER BY name
+----
+Dirk	CS
+Mark	CS
+