Implements generic methods for reading and writing dataframe as files.
Validate if specific file format is supported. 
Raises:
-
RuntimeError
–
If file format is not supported.
read_files_as_df(paths, format, root=None, df_schema=None, options=None)
Read files in some paths list as dataframe. 
write_df_as_files(df, path, format, options=None)
Write dataframe as files in some path. 