** Testcase
DROP DATABASE test;CREATE DATABASE test;USE test; create table t1(c1 int); set global innodb_trx_rseg_n_slots_debug=1; truncate t1; ALTER TABLE t1 ADD COLUMN c4 INT COMMENT ' E ';
** Testcase
DROP DATABASE test;CREATE DATABASE test;USE test; trx_rseg_ n_slots_ debug=1;
create table t1(c1 int);
set global innodb_
truncate t1;
ALTER TABLE t1 ADD COLUMN c4 INT COMMENT ' E ';