testing: convert to character set utf8mb4

Author: Shlomi Noach

localtests/convert-utf8mb4/create.sql

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+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  t varchar(128) charset utf8 collate utf8_general_ci,
+  ta varchar(128) charset ascii not null,
+  primary key(id)
+) 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, md5(rand()), 'a');
+  insert into gh_ost_test values (null, 'novo proprietário', 'b');
+  insert into gh_ost_test values (null, 'usuário', 'c');
+  insert into gh_ost_test values (null, 'usuário', 'x');
+
+  delete from gh_ost_test where ta='x' order by id desc limit 1;
+end ;;

localtests/convert-utf8mb4/extra_args

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+--alter='convert to character set utf8mb4'