Add basic serializable testcase (#198)

Task: OSS-ONLY

Signed-off-by: Kristian Lejao <[email protected]>
(cherry picked from commit 8a276b6)

src/test/regress/expected/serializable.out

@@ -0,0 +1,31 @@
+CREATE TABLE serializable_tab1 (
+    id bigint NOT NULL
+);
+CREATE TABLE serializable_tab2 (
+    id bigint NOT NULL,
+    user_id bigint
+);
+ALTER TABLE ONLY serializable_tab1
+    ADD CONSTRAINT user_constraint UNIQUE (id);
+ALTER TABLE ONLY serializable_tab2
+    ADD CONSTRAINT assignment_constraint UNIQUE (user_id);
+ALTER TABLE ONLY serializable_tab2
+    ADD CONSTRAINT user_assignments_user_id_fkey FOREIGN KEY (user_id) REFERENCES serializable_tab1(id) ON DELETE CASCADE;
+INSERT INTO serializable_tab1 (id) VALUES ('12345');
+INSERT INTO serializable_tab2 (id, user_id) VALUES ('1', '12345');
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+DELETE FROM serializable_tab1 where id = '12345';
+SELECT * FROM serializable_tab1;
+ id 
+----
+(0 rows)
+
+ROLLBACK;
+SELECT * FROM serializable_tab1;
+  id   
+-------
+ 12345
+(1 row)
+
+DROP TABLE serializable_tab2;
+DROP TABLE serializable_tab1;

src/test/regress/parallel_schedule

@@ -135,3 +135,5 @@ test: event_trigger oidjoins
 
 # this test also uses event triggers, so likewise run it by itself
 test: fast_default
+
+test: serializable

src/test/regress/sql/serializable.sql

@@ -0,0 +1,32 @@
+CREATE TABLE serializable_tab1 (
+    id bigint NOT NULL
+);
+
+CREATE TABLE serializable_tab2 (
+    id bigint NOT NULL,
+    user_id bigint
+);
+
+ALTER TABLE ONLY serializable_tab1
+    ADD CONSTRAINT user_constraint UNIQUE (id);
+
+ALTER TABLE ONLY serializable_tab2
+    ADD CONSTRAINT assignment_constraint UNIQUE (user_id);
+
+ALTER TABLE ONLY serializable_tab2
+    ADD CONSTRAINT user_assignments_user_id_fkey FOREIGN KEY (user_id) REFERENCES serializable_tab1(id) ON DELETE CASCADE;
+
+
+INSERT INTO serializable_tab1 (id) VALUES ('12345');
+INSERT INTO serializable_tab2 (id, user_id) VALUES ('1', '12345');
+
+BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+DELETE FROM serializable_tab1 where id = '12345';
+SELECT * FROM serializable_tab1;
+ROLLBACK;
+
+SELECT * FROM serializable_tab1;
+
+DROP TABLE serializable_tab2;
+DROP TABLE serializable_tab1;
+