Last observation carried forward. Sets values for null and missing fields in a window to the last non-null value for the field.
5.2
https://www.mongodb.com/docs/manual/reference/operator/aggregation/locf
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Last observation carried forward. Sets values for null and missing fields in a window to the last non-null value for the field.
5.2
https://www.mongodb.com/docs/manual/reference/operator/aggregation/locf