          Returns the SQL WHERE clause to use in order to perform a full-text
          search of the given field_name. Note that the resulting string should
          contain a '%s' placeholder for the value being searched against.
          """
          raise NotImplementedError('Full-text search is not implemented for this database backend')
  
      def last_executed_query(self, cursor, sql, params):
          """
 
</s> remove         The ``lookup_type`` will be one of the valid Django filter lookups:
        ``"exact"``, ``"iexact"``, ``"contains"``, ``"icontains"``,
        ``"gt"``, ``"gte"``, ``"lt"``, ``"lte"``, ``"in"``, ``"startswith"``,
        ``"istartswith"``, ``"endswith"``, ``"iendswith"``, ``"range"``,
        ``"year"``, ``"month"``, ``"day"``, ``"isnull"``, ``"search"``,
        ``"regex"``, and ``"iregex"``.

        If you are using :doc:`Custom lookups </ref/models/lookups>` the
        ``lookup_type`` can be any ``lookup_name`` registered in the field.
 </s> add         The ``lookup_type`` will be the registered name of the lookup. For
        example: ``"exact"``, ``"iexact"``, or ``"contains"``.
        # RemovedInDjango20Warning
          Returns the SQL WHERE clause to use in order to perform a full-text
          search of the given field_name. Note that the resulting string should
          contain a '%s' placeholder for the value being searched against.
          """
        # RemovedInDjango20Warning
          raise NotImplementedError('Full-text search is not implemented for this database backend')
  
      def last_executed_query(self, cursor, sql, params):
          """
keep keep keep add keep keep keep keep
 Fixed #26285 -- Deprecated the MySQL-specific __search lookup. 
django/db/backends/base/operations.py