
             Description
             Takes a raw file path, and attempts to extract the schema name from it.
             Useful for when interacting with Performance Schema data
             concerning IO statistics, for example.
             Currently relies on the fact that a table data file will be within a
             specified database directory (will not work with partitions or tables
             that specify an individual DATA_DIRECTORY).
             Parameters
             path (VARCHAR(512)):
               The full file path to a data file to extract the schema name from.
             Returns
             VARCHAR(64)
             Example
             mysql> SELECT sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd');
             +----------------------------------------------------------------------------+
             | sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd') |
             +----------------------------------------------------------------------------+
             | employees                                                                  |
             +----------------------------------------------------------------------------+
             1 row in set (0.00 sec)
            