Has anyone tried in the SubClassFetchMode for JPA single table inheritance.

I have an entity Part with subclasses PartBase and PartComposite.  When I do
EJQL query
 select p from Part
openjpa is retrieving all the Part attributes with a single sql select then
doing many many
singleton sql selects by primary key to retrieve the PartBase or
PartComposite attributes
for each part instance.

I've tried  changing SubclassFetchMode but no effect whether I specified

Since the subclass data is in the same table as the base table being
queries,  shouldn't this
data be retrieved with a single select automatically ?

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