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db.getCollection("massive-data").aggregate([ { $match: { friends: {$exists: true, $ne: []} } } , { $unwind: "$friends" } , { $match: { "friends.name" = /^W/ } }, { $group: { _id: "friends.name" } } ]) error: clone(t={}){const r=t.loc||{};return e({loc:new Position("line"in r?r.line:this.loc.line,"column"in r?r.column:...<omitted>...)} could not be cloned.
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