[C++][Parquet] PyArrow Table contains different data after writing and reloading from Parquet

• I'm loading a JSONlines object into a table using 

  pa.json.readjson

  It contains one column that is a nested dictionary.

• I select a row by key and inspect its nested dictionary.
• I write the table to parquet 
• I load the table again from the parquet file 
• I check the same key and the nested dictionary is not the same.

To reproduce:

Find the attached JSONLines file and Jupyter Notebook.

The json file contains entries per customer with a generated `msisdn`, `scoring_request_id` and `scorecard_result` object. Each `scorecard result consists of a list of feature objects, all with the value the same as the msidn` and a score.

The notebook reads the file and demonstrates the issue.