I have two collections both having different schema.
Collection1: ID, Field1, Field2
Collection3: ID, Oc1, OC2, col3_Field1
                 ID1, col3_Oc1
I want to do following JOINs

(-)Query on Collection1
(-)JOIN across collection3 Field1 = collection3.col3_Field1
           Inner JOIN in collection 3
           col3_oc1 = Oc1
I am able to achieve SELF JOIN within a collection and across JOIN as well.

But I am not able do both together.

Any help appreciated.
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