DocumentSourceSequentialDocumentCache::doOptimizeAt() caches on a per-stage basis of the $lookup pipeline. Restructuring the aggregation pipeline so the $objectToArray values are done as a separate stage from the $match that references the $$sk variable would mean their results can be cached too.
The changes made in this ticket will be obsoleted by SERVER-57667 but will reduce the per-document processing overhead by a constant factor.
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SERVER-57579 DocumentSourceSequentialCache doesn't clone, ruining non-correlated $lookup pipeline caching in sharded deployments
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- Closed
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SERVER-57667 Improve processing speed for resharding's collection cloning pipeline
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- Backlog
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- Closed
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