Custom API is not working for functions other than `count`

Hi,

I'm currently working on a PoC using custom API connecting to a Clickhouse database.

I'm having an issue when selecting sum aggregation (or any other function that is not count) for numeric values. 

The table does not display any results:

I believe the response is well formatted as compared to other responses that works:

{
  "aggs": [
    {
      "values": {
        "sale_quantity": {
          "sum": 25650
        }
      },
      "keys": {
        "client_country": "",
        "client_state": ""
      }
    },
    {
      "values": {
        "sale_quantity": {
          "sum": 470691.01269999996
        }
      },
      "keys": {
        "client_country": "",
        "client_state": "AC"
      }
    },
    {
      "values": {
        "sale_quantity": {
          "sum": 5005541.6667
        }
      },
      "keys": {
        "client_country": "",
        "client_state": "AL"
      }
    },
    {
      "values": {
        "sale_quantity": {
          "sum": 4822006.3344
        }
      },
      "keys": {
        "client_country": "",
        "client_state": "AM"
      }
    },
    {
      "values": {
        "sale_quantity": {
          "sum": 67081
        }
      },
      "keys": {
        "client_country": "",
        "client_state": "AP"
      }
    },
    {
      "values": {
        "sale_quantity": {
          "sum": 12944455.116100017
        }
      },
      "keys": {
        "client_country": "",
        "client_state": "BA"
      }
    },
    ...
  ],
  "page": 0,
  "pageTotal": 1
}

If I change to count it works:

Thank you in advance.