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Is there a way to push root documents to specific field on $facet without $group ? For example,

db.artwork.aggregate( [
    $facet: {
      "categorizedByTags": [
        { $unwind: "$tags" },
        { $sortByCount: "$tags" }
      "items": [{$push: "$$ROOT"}] // I want to push all root document to `items`.
                @turivishal When I user empty array, mongodb raise error. "$facet stage cannot be empty."
– alexmoon
                Mar 22, 2021 at 13:48
        
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