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faster $lookup after $group in MongoDB aggregation pipeline

In the previous post One million $lookup challenge I said that $lookup is efficient at the end of an aggregation pipeline, not before the aggregation and I was referencing another post, Comparison of JOINS

Jun 22, 2025 - 22:50
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faster $lookup after $group in MongoDB aggregation pipeline

In the previous post One million $lookup challenge I said that $lookup is efficient at the end of an aggregation pipeline, not before the aggregation and I was referencing another post, Comparison of JOINS

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