TokuDB "Insert Into Select Group By" too slow

MySQL & MariaDB Other MySQL® Questions
1

I’m testing TokuDB because we are thinking to migrate the MyISAM tables to TokuDB.

But there are some queries like:


INSERT INTO Table(M, F, A, D, DC, S, S0)
SELECT
M,
@prmDatetime,
A,
D,
DC,
S,
S0
FROM other_table
group by M;

Is REALLY slow compared to MyISAM. I only found some posts about bulk-fetch that is supposed now should be fixed. I’m using tokudb_version=5.6.27-76.0

Any ideas?