@classmethod<EOL><INDENT>def type_map(cls, mssql_type):<DEDENT>
d = {<EOL><NUM_LIT:3>: '<STR_LIT>',<EOL><NUM_LIT:4>: '<STR_LIT>',<EOL><NUM_LIT:5>: '<STR_LIT>'<EOL>}<EOL>return d[mssql_type] if mssql_type in d else '<STR_LIT>'<EOL>
Helper function that maps from MSSQL fields to BigQuery fields. Used
when a schema_filename is set.