PT-91 Added --preserve-triggers feature for MySQL 5.7+

t/pt-online-schema-change/samples/after_triggers.sql

@@ -0,0 +1,77 @@
+DROP SCHEMA IF EXISTS test;
+CREATE SCHEMA test;
+
+CREATE TABLE test.t1 (
+   id INT NOT NULL AUTO_INCREMENT,
+   f1 INT,
+   f2 VARCHAR(32),
+   PRIMARY KEY (id)
+);
+
+CREATE TABLE test.t2 LIKE test.t1;
+
+CREATE TABLE test.log (
+   ts  TIMESTAMP,
+   msg VARCHAR(255)
+);
+
+
+DROP TRIGGER IF EXISTS test.after_insert;
+DROP TRIGGER IF EXISTS test.after_update;
+DROP TRIGGER IF EXISTS test.after_delete;
+
+
+CREATE TRIGGER test.after_insert
+ AFTER
+ -- a comment here
+   INSERT ON test.t1
+ -- just to make things harder
+   FOR EACH ROW INSERT INTO test.log VALUES (NOW(), CONCAT("inserted new row with id: ", NEW.id))
+ -- for pt_osc
+;
+
+CREATE TRIGGER test.after_insert2
+ AFTER
+ -- a comment here
+   INSERT ON test.t1
+ -- just to make things harder
+   FOR EACH ROW INSERT INTO test.log VALUES (NOW(), CONCAT("inserted duplicate of new row with id: ", NEW.id))
+ -- for pt_osc
+;
+
+DELIMITER //
+
+CREATE TRIGGER test.after_update
+ AFTER
+ -- a comment here
+   UPDATE ON test.t1
+ -- just to make things harder
+   FOR EACH ROW 
+   BEGIN
+     INSERT INTO test.log VALUES (NOW(), CONCAT("updated row row with id ", OLD.id, " old f1:", OLD.f1, " new f1: ", NEW.f1 ));
+     INSERT INTO test.log VALUES (NOW(), CONCAT("updated row row with id ", OLD.id, " old f1:", OLD.f1, " new f1: ", NEW.f1 ));
+   END
+ -- for pt_osc
+//
+
+DELIMITER ;
+
+CREATE TRIGGER test.after_delete
+ AFTER
+ -- a comment here
+   DELETE ON test.t1
+ -- just to make things harder
+   FOR EACH ROW INSERT INTO test.log VALUES (NOW(), CONCAT("deleted row with id: ", OLD.id))
+ -- for pt_osc
+;
+
+
+INSERT INTO test.t1 VALUES
+(1, 1, 'a'), (2, 1, 'b'), (3, 1, 'c'), (4, 1, 'd'),
+(5, 2, 'e'), (6, 2, 'f'), (7, 3, 'h'), (8, 3, 'g');
+
+DELETE FROM test.t1 WHERE f2 = 'h';
+UPDATE test.t1 
+   SET f1 = f1 + 1
+ WHERE f2 = 'g';
+