frictionlessdata/chat

Our schema allows extra headers and missing non-required headers, so the csv could have less (or more) column than the defined schema.

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    report = validate("datapackage.json", checks=["structure", "schema", "foreign-key"], order_fields=True, infer_fields=False)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/goodtables/validate.py", line 80, in validate
    report = inspector.inspect(source, **options)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/goodtables/inspector.py", line 82, in inspect
    table_warnings, table_report = task.get()
  File "/home/didiez/anaconda3/lib/python3.7/multiprocessing/pool.py", line 657, in get
    raise self._value
  File "/home/didiez/anaconda3/lib/python3.7/multiprocessing/pool.py", line 121, in worker
    result = (True, func(*args, **kwds))
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/goodtables/inspector.py", line 200, in __inspect_table
    success = prepare_func(stream, schema, extra)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/goodtables/contrib/checks/foreign_key.py", line 48, in prepare
    current_resource_name=extra['resource-name'])
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/goodtables/contrib/checks/foreign_key.py", line 116, in _get_relations
    relations[resource_name] = resource.read(keyed=True)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/datapackage/resource.py", line 377, in read
    foreign_keys_values=foreign_keys_values, **options)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/tableschema/table.py", line 353, in read
    for count, row in enumerate(rows, start=1):
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/tableschema/table.py", line 215, in iter
    for row_number, headers, row in iterator:
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/tableschema/table.py", line 509, in builtin_processor
    row, row_number=row_number, exc_handler=exc_handler)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/tableschema/schema.py", line 266, in cast_row
    error_data=keyed_row)
  File "/home/didiez/anaconda3/lib/python3.7/site-packages/tableschema/helpers.py", line 90, in default_exc_handler
    raise exc
datapackage.exceptions.CastError: Row length 5 doesn't match fields count 6 for row "2"

If we only check 'structure' and 'schema' everything works as expected.
I could not find any reference in the docs about reading (and casting) csv files with fields not defined in the schema o missing fields (non-required column in schema).
Should I open an issue or it's a known limitation when reading csv files with goodtables?