just a note for people who come across this and are confused: queries in MongoDB use a much more concise document-based query language, not map/reduce. map/reduce in MongoDB is just for aggregations / ETL type operations
The MongoDB query looks just like the execution plan that'd be generated behind the scenes by the query evaluator of any relational database. Except, of course, the MongoDB query isn't optimized nearly as much as the query plan generated by the relational database would be.
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