Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16710#discussion_r98345474
--- Diff:
sql/core/src/test/resources/sql-tests/inputs/subquery/exists-subquery/exists-basic.sql
---
@@ -0,0 +1,115 @@
+-- Tests EXISTS subquery support. Tests basic form
+-- of EXISTS subquery (both EXISTS and NOT EXISTS)
+
+CREATE TEMPORARY VIEW EMP AS SELECT * FROM VALUES
+ (100, "emp 1", date "2005-01-01", 100.00D, 10),
+ (100, "emp 1", date "2005-01-01", 100.00D, 10),
+ (200, "emp 2", date "2003-01-01", 200.00D, 10),
+ (300, "emp 3", date "2002-01-01", 300.00D, 20),
+ (400, "emp 4", date "2005-01-01", 400.00D, 30),
+ (500, "emp 5", date "2001-01-01", 400.00D, NULL),
+ (600, "emp 6 - no dept", date "2001-01-01", 400.00D, 100),
+ (700, "emp 7", date "2010-01-01", 400.00D, 100),
+ (800, "emp 8", date "2016-01-01", 150.00D, 70)
+AS EMP(id, emp_name, hiredate, salary, dept_id);
+
+CREATE TEMPORARY VIEW DEPT AS SELECT * FROM VALUES
+ (10, "dept 1", "CA"),
+ (20, "dept 2", "NY"),
+ (30, "dept 3", "TX"),
+ (40, "dept 4 - unassigned", "OR"),
+ (50, "dept 5 - unassigned", "NJ"),
+ (70, "dept 7", "FL")
+AS DEPT(dept_id, dept_name, state);
+
+CREATE TEMPORARY VIEW BONUS AS SELECT * FROM VALUES
+ ("emp 1", 10.00D),
+ ("emp 1", 20.00D),
+ ("emp 2", 300.00D),
+ ("emp 2", 100.00D),
+ ("emp 3", 300.00D),
+ ("emp 4", 100.00D),
+ ("emp 5", 1000.00D),
+ ("emp 6 - no dept", 500.00D)
+AS BONUS(emp_name, bonus_amt);
+
+-- uncorrelated exist query
+-- TC.01.01
+SELECT *
+FROM emp
+WHERE EXISTS (SELECT 1
+ FROM dept
+ WHERE dept.dept_id > 10
+ AND dept.dept_id < 30);
+
+-- simple correlated predicate in exist subquery
+-- TC.01.02
+SELECT *
+FROM emp
+WHERE EXISTS (SELECT dept.dept_name
+ FROM dept
+ WHERE emp.dept_id = dept.dept_id);
+
+-- correlated outer isnull predicate
+-- TC.01.03
+SELECT *
+FROM emp
+WHERE EXISTS (SELECT dept.dept_name
+ FROM dept
+ WHERE emp.dept_id = dept.dept_id
+ OR emp.dept_id IS NULL);
+
+-- Simple correlation with a local predicate in outer query
+-- TC.01.04
+SELECT *
+FROM emp
+WHERE EXISTS (SELECT dept.dept_name
+ FROM dept
+ WHERE emp.dept_id = dept.dept_id)
+ AND emp.id > 200;
+
+-- Outer references (emp.id) should not be pruned from outer plan
+-- TC.01.05
+SELECT emp.emp_name
+FROM emp
+WHERE EXISTS (SELECT dept.state
+ FROM dept
+ WHERE emp.dept_id = dept.dept_id)
+ AND emp.id > 200;
+
+-- not exists with correlated predicate
+-- TC.01.06
+SELECT *
+FROM dept
+WHERE NOT EXISTS (SELECT emp_name
+ FROM emp
+ WHERE emp.dept_id = dept.dept_id);
+
+-- not exists with correlated predicate + local predicate
+-- TC.01.07
+SELECT *
+FROM dept
+WHERE NOT EXISTS (SELECT emp_name
+ FROM emp
+ WHERE emp.dept_id = dept.dept_id
+ OR state = 'NJ');
+
+-- not exist both equal and greaterthan predicate
+-- TC.01.08
+SELECT *
+FROM bonus
+WHERE NOT EXISTS (SELECT *
+ FROM emp
+ WHERE emp.emp_name = emp_name
+ AND bonus_amt > emp.salary);
--- End diff --
Could you also add one more test case, which is very like `TC.01.08`? This
test case is used very often in the real world. BTW, you do not need to run
DB2. We can know the results using our naked eyes. : )
```SQL
-- select values present in one table but missing in another one
SELECT emp.*
FROM emp
WHERE NOT EXISTS (SELECT NULL
FROM bonus
WHERE bonus.emp_name = emp.emp_name);
```
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