How would you explain Aggregation Pipeline to a junior engineer?

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Follow-up questions

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→What trade-offs come with Aggregation Pipeline?Open
→How would you explain Aggregation Pipeline to a junior engineer?Open
→Design a small subsystem that relies on Aggregation PipelineOpen

Parent context — Aggregation Pipeline

Use Aggregation Pipeline as the core idea. Example shape: Monthly revenue by category: $match date range, $unwind items, $group by category sum price..

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