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Operating System:
ALL
Backport Requested:

v5.1
Steps To Reproduce:

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db.test.insertMany([\{val: new Date()}, \{val: 2}])

db.test.aggregate([{$densify: {field: "val", range:
{step: 1, bounds: "full", unit: "day"}
}}])

Mongod log: "{"t":
{"$date":"2021-10-07T16:05:59.342+00:00"}
,"s":"F", "c":"CONTROL", "id":4757800, "ctx":"conn1","msg":"Writing fatal message","attr":{"message":"std::exception::what(): bad_variant_access\nActual exception type: mpark::bad_variant_access\n"}}"

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db.test.insertMany( [\{val: new Date()}, \{val: 2}] ) db.test.aggregate([{$densify: {field: "val", range: {step: 1, bounds: "full", unit: "day"} }}]) Mongod log: "{"t": {"$date":"2021-10-07T16:05:59.342+00:00"} ,"s":"F", "c":"CONTROL", "id":4757800, "ctx":"conn1","msg":"Writing fatal message","attr":{"message":"std::exception::what(): bad_variant_access\nActual exception type: mpark::bad_variant_access\n"}}"

Bad variant access when $densify is called on a collection where the values in the field that is being densified can be either a date or a number.

duplicates

SERVER-60536 Add uasserts for type mismatches in collection for $densify