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create table t1 (a int);
alter table mysql.column_stats rename to mysql.column_stats1;
flush tables;
alter table t1 change a b varchar(100);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`b` varchar(100) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
alter table mysql.column_stats1 rename to mysql.column_stats;
drop table t1;
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