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drop table if exists t;
set tokudb_disable_hot_alter=ON;
set default_storage_engine=tokudb;
create table t (id int, x char(2), primary key (id), unique key (x));
insert into t values (1,'aa'),(2,'ab');
alter table t modify x char(1);
ERROR 23000: Duplicate entry 'a' for key 'x'
drop table t;
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