如何在mongodb中找到包含NaN值的字段的$avg和$sum？

db.collection.aggregate([
  {
    $project: {
      fieldWithNaN: {
        $cond: {
          if: { $ne: ["$field", NaN] },
          then: "$field",
          else: 0
        }
      }
    }
  },
  {
    $group: {
      _id: null,
      avgWithNaN: { $avg: "$fieldWithNaN" },
      sumWithNaN: { $sum: "$fieldWithNaN" }
    }
  }
])