timestamp/datetime submillis corruption fix

Author: Shlomi Noach

localtests/datetime-submillis-zeroleading/create.sql

@@ -0,0 +1,27 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  i int not null,
+  dt0 datetime(6),
+  dt1 datetime(6),
+  ts2 timestamp(6),
+  updated tinyint unsigned default 0,
+  primary key(id),
+  key i_idx(i)
+) auto_increment=1;
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test values (null, 11, '2016-10-31 11:22:33.0123', now(), '2016-10-31 11:22:33.0369', 0);
+  update gh_ost_test set dt1='2016-10-31 11:22:33.0246', updated = 1 where i = 11 order by id desc limit 1;
+
+  insert into gh_ost_test values (null, 13, '2016-10-31 11:22:33.0123', now(6), '2016-10-31 11:22:33.0369', 0);
+end ;;