I haven't been following this discussion, and that's not likely to
change. I want to pop in, however, to point out that Kodo has had
JDOQL subqueries for a long time. They're likely too limited and
under-specified for the spec group's purposes, but perhaps they'll
give you some ideas:
http://solarmetric.com/Software/Documentation/4.0.0/docs/full/html/
ref_guide_enterprise_queryext.html#ref_guide_subqueries
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