Comment 11 for bug 1193138

********** Testcase

DROP DATABASE test;CREATE DATABASE test;USE test;
set global innodb_limit_optimistic_insert_debug=2;
CREATE TABLE t1(a INT,INDEX(a)) ENGINE=InnoDB;
INSERT INTO t1 VALUES(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1),(1);
insert into t1 value(1);
insert into t1 values(1);
SET innodb_fake_changes=1;
SET GLOBAL innodb_disable_background_merge=ON;
INSERT INTO t1 VALUES(),(),();