274             result &= frozenset(step.execute())

   274             result &= frozenset(step.execute())

   275         result = list(result)

   275         result = list(result)

   276         if self.offset:

   276         if self.offset:

   277             result = result[self.offset:]

   277             result = result[self.offset:]

   278         if self.limit:

   278         if self.limit:

   280         return result

   280         return result

   281 

   281 

   282 

   282 

   283 class UnionFetchStep(Step):

   283 class UnionFetchStep(Step):

   284     """union results of child steps using temporary tables (e.g. FetchStep)"""

   284     """union results of child steps using temporary tables (e.g. FetchStep)"""