Certain customers who have no arrays at all in their databases would like a workaround to get an implementation of SERVER-109703 in the short term, before we build out the Arrayness API. This can be based on https://github.com/10gen/mongo/commit/4c4bff429040161aa3c902765946a9962a73e525
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SERVER-109703 Support swapping $match before "complex renames" when there are provably no arrays involved
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- Backlog
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