EXCEPT/INTERSECT fails in views

EXCEPT or INTERSECT in views give:

ERROR XJ001: Java exception: 'ASSERT FAILED costEstimate is not expected to be null for org.apache.derby.impl.sql.compile.SelectNode: org.apache.derby.iapi.services.sanity.AssertFailure

To recreate, run:

create table tab1 (i integer primary key);
insert into tab1 values (1),(2),(3),(4);
create table tab2 (i integer primary key);
insert into tab2 values (2),(4);
create view view1 as select * from tab1 intersect select * from tab2;
select * from view1;
.