Oracle int data type issues

[eknv21]

In Cloud Data Fusion, i am using oracle plugin provided to get data from Oracle 18c database. When using this for source, I able to successfully extract varchar data, but the number/integer types are not successful. Oracle table values are:

|ID (int) | NAME(varchar2) |
----------------------------
|501      | raja           |
|502      | praveen        |

Preview on DataFusion shows as below, notice the ID column, the values are different :

|ID(decimal)  | NAME (string)  |
--------------------------------
|[1,-11]      | raja           |
|[1,-10]      | praveen        |

On the output file, i can see the values as:

[B@5f50fd07,raja
[B@6787d919,praveen

What are these values on ID column getting translated to? For decimals in oracle table, i get values like [0,-61,-66]. Are there implicit conversion of number types in data fusion. I'm using the oracle drivers provided by Data fusion.