text: use sharding;
  delete from t3 where name = 'Santa Sofía de la Piedad';
  alter table t2 add column age int;
  update t2 set uid = uid + 10000;
  alter table t3 add column age int;
  update t3 set age = 1;
  alter table t2 add column info_json json GENERATED ALWAYS AS (`info`) VIRTUAL;
  update t3 set age = age + 10;
  alter table t3 add column info_json json GENERATED ALWAYS AS (`info`) VIRTUAL;
  alter table t3 add column id_gen int as (uid + 1);
  alter table t2 add column id_gen int as (uid + 1);
  alter table t2 add unique (id_gen);
  alter table t3 add unique (id_gen);
  update t2 set age = age + 10;
  alter table t2 add key multi_col_idx(uid, id_gen);
  alter table t3 add key multi_col_idx(uid, id_gen);
  update t3 set age = age + 10;
  