このWARNINGの意味ようやく分かったぜ... "The output of the map function's emit (the second argument) and the value returned by reduce should be the same format to make iterative reduce possible. If not, there will be weird bugs that are hard to debug."
Starting in MongoDB 5.0, map-reduce is deprecated: Instead of map-reduce, you should use an aggregation pipeline. Aggregation pipelines provide better performance and usability than map-reduce. You...
このWARNINGの意味ようやく分かったぜ... "The output of the map function's emit (the second argument) and the value returned by reduce should be the same format to make iterative reduce possible. If not, there will be weird bugs that are hard to debug."
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Map-Reduce - MongoDB Manual
Starting in MongoDB 5.0, map-reduce is deprecated: Instead of map-reduce, you should use an aggregation pipeline. Aggregation pipelines provide better performance and usability than map-reduce. You...
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