MDEV-9737 Duplicate error in replication with slave triggers and auto increment

delete deferred events after they're executed
(otherwise they can be executed again for a sub-statement)

See also
commit 0e78d1d
Author: Venkatesh Duggirala <venkatesh.duggirala@oracle.com>
Date:   Wed Mar 20 11:20:47 2013 +0530

    BUG#15850951-DUPLICATE ERROR IN REPLICATION WITH SLAVE
    TRIGGERS AND AUTO INCREMENT

mysql-test/suite/rpl/r/ignore_table_autoinc-9737.result

+include/master-slave.inc
+[connection master]
+call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT");
+create table t1(id int auto_increment primary key);
+create table t2(id int auto_increment primary key);
+create table slave_only(id int auto_increment primary key);
+insert into slave_only values(NULL);
+create trigger t1i after insert on t1 for each row insert into slave_only values(NULL);
+stop slave;
+set global replicate_ignore_table="test.t2";
+start slave;
+insert into t2 values(NULL);
+insert into t1 values(NULL);
+drop table t1, t2, slave_only;
+stop slave;
+set global replicate_ignore_table="";
+start slave;
+drop table t1, t2;
+include/rpl_end.inc

mysql-test/suite/rpl/t/ignore_table_autoinc-9737.test

+#
+# MDEV-9737 Duplicate error in replication with slave triggers and auto increment
+#
+source include/master-slave.inc;
+call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT");
+
+
+create table t1(id int auto_increment primary key);
+create table t2(id int auto_increment primary key);
+
+sync_slave_with_master;
+create table slave_only(id int auto_increment primary key);
+insert into slave_only values(NULL);
+create trigger t1i after insert on t1 for each row insert into slave_only values(NULL);
+
+stop slave;
+set global replicate_ignore_table="test.t2";
+start slave;
+
+connection master;
+insert into t2 values(NULL);
+insert into t1 values(NULL);
+
+sync_slave_with_master;
+
+drop table t1, t2, slave_only;
+stop slave;
+set global replicate_ignore_table="";
+start slave;
+
+connection master;
+drop table t1, t2;
+
+source include/rpl_end.inc;
+

sql/log_event.cc

@@ -7463,6 +7463,7 @@ bool slave_execute_deferred_events(THD *thd)
     return res;
 
   res= rgi->deferred_events->execute(rgi);
+  rgi->deferred_events->rewind();
 
   return res;
 }