insert into t_big_metadata(i,j) values (1,101) , (2,102) , (3,103) ;
delete from t_big_metadata where i = 2;
select i,j from t_big_metadata where i = 1;
i	j
1	101
alter table t_big_metadata add index(j), algorithm=inplace;
alter table t_big_metadata drop column c8, add column k int, algorithm=copy;
select i,j,k from t_big_metadata where j < 103;
i	j	k
1	101	NULL
drop table t_big_metadata;