Removing single column limit from join table M2M mapping detection. (#1593)

test/fixtures/data.sql

@@ -140,6 +140,26 @@ INSERT INTO users_tasks VALUES (3, 5);
 TRUNCATE TABLE comments CASCADE;
 INSERT INTO comments VALUES (1, 1, 2, 6, 'Needs to be delivered ASAP');
 
+--
+-- Data for Name: files; Type: TABLE DATA; Schema: test; Owner: -
+--
+
+TRUNCATE TABLE files CASCADE;
+INSERT INTO files VALUES
+	 (1, 'command.com', '#include <unix.h>')
+	,(1, 'autoexec.bat', '@ECHO OFF')
+	,(1, 'io.sys', 'TODO')
+	,(2, 'README.md', '# make $$$!')
+	,(2, 'marketing.key', '$-$')
+	;
+
+TRUNCATE TABLE touched_files CASCADE;
+INSERT INTO touched_files VALUES
+	 (1, 1, 1, 'command.com')
+	,(1, 1, 1, 'autoexec.bat')
+	,(1, 1, 2, 'README.md')
+	,(3, 1, 1, 'autoexec.bat')
+	;
 
 --
 -- Data for Name: complex_items; Type: TABLE DATA; Schema: test; Owner: -

test/fixtures/privileges.sql

@@ -43,6 +43,8 @@ GRANT ALL ON TABLE
     , users
     , users_projects
     , users_tasks
+    , files
+    , touched_files
     , "Escap3e;"
     , "ghostBusters"
     , "withUnique"

test/fixtures/schema.sql

@@ -697,6 +697,28 @@ alter table only comments
     add constraint "user" foreign key (commenter_id) references users(id),
     add constraint comments_task_id_fkey foreign key (task_id, user_id) references users_tasks(task_id, user_id);
 
+CREATE TABLE files (
+    project_id integer NOT NULL,
+    filename text NOT NULL,
+    content text NOT NULL,
+    PRIMARY KEY (project_id, filename)
+);
+
+CREATE TABLE touched_files (
+    user_id integer NOT NULL,
+    task_id integer NOT NULL,
+    project_id integer NOT NULL,
+    filename text NOT NULL,
+    CONSTRAINT fk_users_tasks
+	FOREIGN KEY (user_id, task_id)
+	REFERENCES users_tasks (user_id, task_id)
+	ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT fk_upload
+	FOREIGN KEY (project_id, filename)
+	REFERENCES files (project_id,filename)
+	ON DELETE CASCADE ON UPDATE CASCADE
+);
+
 create table private.articles (
     id integer primary key,
     body text,