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Affects Compass, VSCode, and mongosh.
1. Add a $fill aggregation stage as sugar for $setWindowFields
- $fill will support linear interpolation and carry forward for new values
- This will only support numeric and date values
- $fill will support filling by an expression
- $fill will support filling on multiple fields at once
- $fill will support partitioning
2. Write performance tests for the new aggregation stage
More details: https://docs.google.com/document/d/1VRwaXpUDTQ1OLqwBnecZPqOk7whgQE5OFsa-OhXdLFE/edit#
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