Streaming Expression - cartesianProduct

[Kojo]

Wrap cartesianProduct function with fetch function works as expected.

But rollup function over cartesianProduct doesn´t aggregate on a returned
field of the cartesianProduct.


The field "id_researcher" bellow is a Multivalued field:



This one works:


fetch(reasercher,

    cartesianProduct(
        having(
            cartesianProduct(
            search(schoolarship,zkHost="localhost:9983",qt="/export",q="*:*",
fl="process, area, id_reasercher",sort="process asc"),
            area
        ),
        eq(area, val(Anything))),
    id_reasercher),
    fl="name, django_id",
    on="id_reasercher=django_id"
)


This one doesn´t works:

rollup(

    cartesianProduct(
        having(
            cartesianProduct(
            search(schoolarship,zkHost="localhost:9983",qt="/export",q="*:*",
fl="process, area, id_researcher, status",sort="process asc"),
            area
        ),
        eq(area, val(Anything))),
    id_researcher),
    over=id_researcher,count(*)
)

If I aggregate over a non MultiValued field, it works.


Is that correct, rollup doesn´t work on a cartesianProduct?