Sorting and grouping in udf

Hi,

I need to group my result based on the accountNumber and sort them on the basis of due date. I have written a udf that is grouping correctly, but i am not able to sort on the basis of duedate. Can anyone help me in writing correct udf which performs both the operations.

Udf :

function getData(touples)
  local function mapper(rec)
  local element = map()
    element["id"] = rec["accountNumber"];
    element['doc'] = map()
    element['doc']["accountNumber"] = rec["accountNumber"]
    element['doc']["clientCode"] = rec["clientCode"]
    element['doc']["amountDue"] = rec["amountDue"];
    element['doc']["fileName"] = rec["fileName"];
    element['doc']["dueDate"] = rec["dueDate"];
    element['doc']["dueDateTimstamp"] = rec["dueDateTimstamp"];
    if rec['authToken1'] then
      element['doc']['authToken1'] = rec['authToken1'];
    end
    if rec['authToken2'] then
      element['doc']['authToken2'] = rec['authToken2'];
    end
    if rec['authToken3'] then
      element['doc']['authToken3'] = rec['authToken3'];
    end
  return element
end
local function accumulate(currentList, nextElement)
   local sensorType = nextElement["accountNumber"]
   local element = map();
     element = mapper(nextElement);
     if currentList[sensorType] == nil then
         currentList[sensorType] = list()
     end
     list.append(currentList[sensorType], element)
   return currentList
end
local function mymerge(a, b)
   return list.merge(a, b)
end
local function reducer(this, that)
   return map.merge(this, that, mymerge)
end
return touples:aggregate(map{}, accumulate) : reduce(reducer)
end

Result I am getting :

[
  {
    "key": null,
    "bins": {
      "1-319": [
        {
          "doc": {
            "amountDue": 1313,
            "fileName": null,
            "dueDate": "04-JUN-20",
            "accountNumber": "******",
            "dueDateTimstamp": null,
            "clientCode": "a"
          },
          "id": "1-319"
        },
        {
          "doc": {
            "amountDue": 11130,
            "fileName": null,
            "dueDate": "08-JUN-20",
            "accountNumber": "1-319",
            "dueDateTimstamp": null,
            "clientCode": "a"
          },
          "id": "1-319"
        },
        {
          "doc": {
            "amountDue": 1113,
            "fileName": null,
            "dueDate": "05-JUN-20",
            "accountNumber": "1-319",
            "dueDateTimstamp": null,
            "clientCode": "a"
          },
          "id": "1-319"
        }
      ],
      "2-219": [
        {
          "doc": {
            "amountDue": 161130,
            "fileName": null,
            "dueDate": "04-JUN-20",
            "accountNumber": "2-219",
            "dueDateTimstamp": null,
            "clientCode": "a"
          },
          "id": "919911996-219"
        },
        {
          "doc": {
            "amountDue": 11130,
            "fileName": null,
            "dueDate": "08-JUN-20",
            "accountNumber": "2-219",
            "dueDateTimstamp": null,
            "clientCode": "q"
          },
          "id": "2-219"
        }
      ]
    }
  }
]

I also want to sort it on the basis of dueDate

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