How to force NHibernate to always do a join for many-to-one -

nhibernate rather smart , omits joins on many-to-one if fields related entity not used in query. however, want formula discriminator on other table without subselect, did custom persister with

protected override string discriminatorformulatemplate {     { return this.discriminatorformula; } } 

and specified column name in formula (but column name related table)

<discriminator formula="typeid" /> 

i understand prone name conflicts, in specific case not problem.

so want force related (many-to-one) table joined main one. best way this? joined times, when hn detects fields used, not know how force time.

<many-to-one ... fetch="join"/> 

this covers get, criteria , lazy load, not hql.

another option using custom sql operations, , select subquery instead of table (with join inside query)

unfortunately, @ point hack. way nh designed, discriminator must in same table.