def get_col(self, alias, output_field=None):
if output_field is None:<EOL><INDENT>output_field = self<EOL><DEDENT>if alias != self.model._meta.db_table or output_field != self:<EOL><INDENT>return DecryptedCol(<EOL>alias,<EOL>self,<EOL>output_field<EOL>)<EOL><DEDENT>else:<EOL><INDENT>return self.cached_col<EOL><DEDENT>
Get the decryption for col.