Json Result length not requested length

[1084540622]

When parsing MySQL 8.0 binlog using python-mysql-replication. A Value of Json field is too long. Appearance of Result length not requested length phenomenon

Environment

• Python Version: Python 3.5
• MySQL Version: MySQL 8.0
• requirements.txt: python-mysql-replication 0.19

Traceback (most recent call last):
  File "c:\Users\zhongbiao\.vscode\extensions\ms-python.python-2019.8.30787\pythonFiles\ptvsd_launcher.py", line 43, in <module>
    main(ptvsdArgs)
  File "c:\Users\zhongbiao\.vscode\extensions\ms-python.python-2019.8.30787\pythonFiles\lib\python\ptvsd\__main__.py", line 432, in main
    run()
  File "c:\Users\zhongbiao\.vscode\extensions\ms-python.python-2019.8.30787\pythonFiles\lib\python\ptvsd\__main__.py", line 316, in run_file
    runpy.run_path(target, run_name='__main__')
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "c:\Users\zhongbiao\Desktop\mbinlog.py", line 45, in <module>
    main()
  File "c:\Users\zhongbiao\Desktop\mbinlog.py", line 22, in main
    for row in binlogevent.rows:
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\row_event.py", line 427, in rows
    self._fetch_rows()
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\row_event.py", line 422, in _fetch_rows
    self.__rows.append(self._fetch_one_row())
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\row_event.py", line 511, in _fetch_one_row
    row["before_values"] = self._read_column_data(self.columns_present_bitmap)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\row_event.py", line 181, in _read_column_data
    values[name] = self.packet.read_binary_json(column.length_size)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 352, in read_binary_json
    return self.read_binary_json_type(t, length)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 357, in read_binary_json_type
    return self.read_binary_json_object(length - 1, large)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 440, in read_binary_json_objectysqlreplication\packet.py", line 440, in read_binary_json_object
    data = self.read_binary_json_type(t, length)                                       ysqlreplication\packet.py", line 361, in read_binary_json_type
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 361, in read_binary_json_type                         ysqlreplication\packet.py", line 269, in read_variable_length_string
    return self.read_variable_length_string()
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 269, in read_variable_length_stringysqlreplication\packet.py", line 269, in read_variable_length_string
    return self.read(length)
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysqlreplication\packet.py", line 152, in read
    return data + self.packet.read(size - len(data))
  File "C:\Users\zhongbiao\AppData\Local\Programs\Python\Python35\lib\site-packages\pymysql\protocol.py", line 73, in read
    raise AssertionError(error)
AssertionError: Result length not requested length:
Expected=434314973550195661.  Actual=86307.  Position: 86335.  Data Length: 172642

[juravlikk]

Got the same and described into the #226 : #226 (comment)