set global innodb_compression_level = 0;
create table t1 (f1 int primary key, f2 longblob)
row_format=compressed, engine=innodb;
set debug='+d,innodb_zlob_print';
insert into t1 values (1, repeat('+', 1048576));
set debug='-d,innodb_zlob_print';
select f1, right(f2, 40) from t1;
f1	right(f2, 40)
1	++++++++++++++++++++++++++++++++++++++++
drop table t1;
set global innodb_compression_level = default;