DocumentReference join query
Please add a join query to Cloud Firestore. It seems that using DocumentReference for the join would be appropriate.
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      Hillary Mutalii commented We can help me 
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      Chukwuemeka Stanley commented This is much needed feature. 
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      Eshwar Uppala commented this would definitely enable us to build complex systems 
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      Ivan Curada commented + 1 
 This would be wonderful especially when you work with collectionGroup query with subcollections
