2 files changed, 90 insertions, 0 deletions
diff --git a/mysql-test/r/events_bugs.result b/mysql-test/r/events_bugs.result
index dfb8f008c5a..740f94fb061 100644
--- a/mysql-test/r/events_bugs.result
+++ b/mysql-test/r/events_bugs.result
@@ -535,6 +535,7 @@ DROP EVENT e3;
 DROP EVENT e2;
 DROP EVENT e1;
 SET TIME_ZONE=@save_time_zone;
+SET TIMESTAMP=DEFAULT;
 drop event if exists new_event;
 CREATE EVENT new_event ON SCHEDULE EVERY 0 SECOND DO SELECT 1;
 ERROR HY000: INTERVAL is either not positive or too big
@@ -756,6 +757,45 @@ SHOW EVENTS;
 Db	Name	Definer	Time zone	Type	Execute at	Interval value	Interval field	Starts	Ends	Status	Originator	character_set_client	collation_connection	Database Collation
 DROP DATABASE event_test1;
 DROP DATABASE event_test12;
+#
+# Bug#12546938 (formerly known as bug#61005):
+# CREATE IF NOT EXIST EVENT WILL CREATE MULTIPLE RUNNING EVENTS
+#
+USE events_test;
+SET GLOBAL event_scheduler = ON;
+DROP TABLE IF EXISTS table_bug12546938;
+DROP EVENT IF EXISTS event_Bug12546938;
+CREATE TABLE table_bug12546938 (i INT);
+# Create an event which will be executed with a small delay
+# and won't be automatically dropped after that.
+CREATE EVENT event_Bug12546938
+ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 SECOND ON COMPLETION PRESERVE
+ENABLE DO
+BEGIN 
+INSERT INTO table_bug12546938 VALUES(1);
+END
+|
+# Now try to create the same event using CREATE EVENT IF NOT EXISTS.
+# A warning should be emitted. A new event should not be created nor
+# the old event should be re-executed.
+CREATE EVENT IF NOT EXISTS event_bug12546938
+ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 SECOND ON COMPLETION PRESERVE
+ENABLE DO
+BEGIN
+INSERT INTO table_bug12546938 VALUES (1);
+END
+|
+Warnings:
+Note	1537	Event 'event_bug12546938' already exists
+# Wait until at least one instance of event is executed.
+# Check that only one instance of our event was executed.
+SELECT COUNT(*) FROM table_bug12546938;
+COUNT(*)
+1
+# Clean-up.
+DROP EVENT IF EXISTS event_Bug12546938;
+DROP TABLE table_bug12546938;
+SET GLOBAL EVENT_SCHEDULER = OFF;
 DROP DATABASE events_test;
 SET GLOBAL event_scheduler= 'ON';
 SET @@global.concurrent_insert= @concurrent_insert;
diff --git a/mysql-test/t/events_bugs.test b/mysql-test/t/events_bugs.test
index 420e7183621..4601448763c 100644
--- a/mysql-test/t/events_bugs.test
+++ b/mysql-test/t/events_bugs.test
@@ -857,6 +857,7 @@ DROP EVENT e2;
 DROP EVENT e1;
 
 SET TIME_ZONE=@save_time_zone;
+SET TIMESTAMP=DEFAULT;
 
 #
 # START - BUG#28666 CREATE EVENT ... EVERY 0 SECOND let server crash
@@ -1235,6 +1236,55 @@ SHOW EVENTS;
 DROP DATABASE event_test1;
 DROP DATABASE event_test12;
 
+--echo #
+--echo # Bug#12546938 (formerly known as bug#61005):
+--echo # CREATE IF NOT EXIST EVENT WILL CREATE MULTIPLE RUNNING EVENTS
+--echo #
+USE events_test;
+SET GLOBAL event_scheduler = ON;
+
+--disable_warnings
+DROP TABLE IF EXISTS table_bug12546938;
+DROP EVENT IF EXISTS event_Bug12546938;
+--enable_warnings
+CREATE TABLE table_bug12546938 (i INT); 
+
+delimiter |;
+
+--echo # Create an event which will be executed with a small delay
+--echo # and won't be automatically dropped after that.
+CREATE EVENT event_Bug12546938
+ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 SECOND ON COMPLETION PRESERVE
+ENABLE DO
+BEGIN 
+  INSERT INTO table_bug12546938 VALUES(1);
+END
+|
+
+--echo # Now try to create the same event using CREATE EVENT IF NOT EXISTS.
+--echo # A warning should be emitted. A new event should not be created nor
+--echo # the old event should be re-executed.
+CREATE EVENT IF NOT EXISTS event_bug12546938
+ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 SECOND ON COMPLETION PRESERVE
+ENABLE DO
+BEGIN
+  INSERT INTO table_bug12546938 VALUES (1);
+END
+|
+
+delimiter ;|
+
+--echo # Wait until at least one instance of event is executed.
+let $wait_condition= SELECT COUNT(*) FROM table_bug12546938;
+--source include/wait_condition.inc
+
+--echo # Check that only one instance of our event was executed.
+SELECT COUNT(*) FROM table_bug12546938;
+
+--echo # Clean-up.
+DROP EVENT IF EXISTS event_Bug12546938;
+DROP TABLE table_bug12546938;
+SET GLOBAL EVENT_SCHEDULER = OFF;
 
 ###########################################################################
 #