Test case for MyISAM and OPTIMIZE TABLE

that requires MDL_SHARED_NO_READ_WRITE.

mysql-test/r/myisam_optimize.result

+call mtr.add_suppression(" marked as crashed and should be repaired");
+create table t1 (a int auto_increment primary key, b text);
+insert t1 (b) select repeat("A", 100);
+insert t1 (b) select repeat("B", 200) from t1;
+insert t1 (b) select repeat("C", 300) from t1;
+delete from t1 where a < 3;
+explain select a, left(b,10) from t1 order by a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using filesort
+select left(b,10), a from t1 order by a;
+left(b,10)	a
+CCCCCCCCCC	3
+CCCCCCCCCC	4
+set debug_sync='myisam_after_repair_by_sort wait_for go';
+optimize table t1;
+select a, left(b,10) from t1 order by a;
+set debug_sync='now signal go';
+Table	Op	Msg_type	Msg_text
+test.t1	optimize	status	OK
+a	left(b,10)
+3	CCCCCCCCCC
+4	CCCCCCCCCC
+drop table t1;

mysql-test/t/myisam_optimize.test

+#
+# test OPTIMIZE and a concurrent SELECT of a MyISAM table
+#
+source include/have_debug_sync.inc;
+
+call mtr.add_suppression(" marked as crashed and should be repaired");
+
+create table t1 (a int auto_increment primary key, b text);
+insert t1 (b) select repeat("A", 100);
+insert t1 (b) select repeat("B", 200) from t1;
+insert t1 (b) select repeat("C", 300) from t1;
+
+delete from t1 where a < 3;
+explain select a, left(b,10) from t1 order by a;
+select left(b,10), a from t1 order by a;
+
+set debug_sync='myisam_after_repair_by_sort wait_for go';
+send optimize table t1;
+
+connect (con1,localhost,root,,);
+let $wait_condition=
+  select count(*) = 1 from information_schema.processlist
+  where state like "%myisam_after_repair_by_sort%";
+--source include/wait_condition.inc
+
+send select a, left(b,10) from t1 order by a;
+
+connect (con2,localhost,root,,);
+let $wait_condition=
+  select count(*) = 1 from information_schema.processlist
+  where state = "Waiting for table metadata lock";
+--source include/wait_condition.inc
+
+set debug_sync='now signal go';
+
+connection default;
+reap;
+
+connection con1;
+reap;
+
+disconnect con1;
+disconnect con2;
+connection default;
+
+drop table t1;
+