1# 2# MDEV-18788 Live upgrade from MySQL 5.6/5.7 to MariaDB 10.4 fails with "Event Scheduler: An error occurred when initializing system tables" 3# 4create table t1 (a int); 5alter table mysql.column_stats rename to mysql.column_stats1; 6flush tables; 7alter table t1 change a b varchar(100); 8show create table t1; 9alter table mysql.column_stats1 rename to mysql.column_stats; 10drop table t1; 11