Hi,
I found some missing function in Sequence.

in galera cluster, Create Sequence's INCREMNET option must be updated, because nextval() function is occuring a Duplicate entry Error.

when using 2-node Galera Cluster,
create sequence s33 increment=0;
create table tbs33 (i int primary key default nextval(s33), b int);

insert into tbs33 (b) values(111);
insert into tbs33 (b) values(222);
........

sometime after,
Another Node is Joined in Galera Cluster,(now 3-node)
then cluster occuring a error, like below.
ERROR 1062 (23000): Duplicate entry '31' for key 'PRIMARY'

I thought Sequence function must be updated.
If New cluster node is joined, Sequece function also modified, along with joined node.

See below description.
https://mariadb.com/kb/en/library/create-sequence/
'Setting an increment of 0 causes the sequence to use the value of the auto_increment_increment system variable at the time of creation, which is always a positive number.'

[...at the time of creation...]
I think it will be updated like below
[...at the time of creation... And will be updated along with joined cluster node.]

Galera Cluster's node flexibility is not reflecting in recent version of MariaDB Sequecne engine.
Thank you.