@property
def _default_columns(self):
    '\n        Must be set by subclasses.\n\n        This should return an array of columns which are in the result table of\n        ``._create_query()``. These columns will be returned by default when\n        ``.get_data()`` is called.\n        '
    raise NotImplementedError
Must be set by subclasses.

This should return an array of columns which are in the result table of
``._create_query()``. These columns will be returned by default when
``.get_data()`` is called.
@property
def _default_columns(self):
    '\n        Must be set by subclasses.\n\n        This should return an array of columns which are in the result table of\n        ``._create_query()``. These columns will be returned by default when\n        ``.get_data()`` is called.\n        '
    raise NotImplementedError