如何使用mongodb聚合管道从对象内部的对象中移除空字符串和数组？

db.collection.aggregate([
  { $match: { /* 匹配条件 */ } },
  { $addFields: {
    newObject: {
      $map: {
        input: { $objectToArray: "$originalObject" },
        as: "item",
        in: {
          k: "$$item.k",
          v: {
            $reduce: {
              input: "$$item.v",
              initialValue: [],
              in: {
                $cond: {
                  if: { $or: [
                    { $eq: [ "$$this", "" ] },
                    { $eq: [ { $type: "$$this" }, "array" ] }
                  ] },
                  then: [],
                  else: "$$value"
                }
              }
            }
          }
        }
      }
    }
  } },
  { $addFields: {
    newObject: { $arrayToObject: "$newObject" }
  } },
  { $project: {
    _id: 1,
    originalObject: 1,
    newObject: 1
  } }
])