docs: def readBatchTupleQuotes(self, symbols, start, end):
          '''
          read batch quotes as tuple to save memory
          '''
          if end is None:
              end=sys.maxint
  
          ret={}
          session=self.getReadSession()()
          try:
              symbolChunks=splitListEqually(symbols, 100)
              for chunk in symbolChunks:
                  rows=session.query(Quote.symbol, Quote.time, Quote.close, Quote.volume,
                                       Quote.low, Quote.high).filter(and_(Quote.symbol.in_(chunk),
                                                                                Quote.time >= int(start),
                                                                                Quote.time < int(end)))
  
                  for row in rows:
                      if row.time not in ret:
                          ret[row.time]={}
  
                      ret[row.time][row.symbol]=self.__sqlToTupleQuote(row)
          finally:
              self.getReadSession().remove()
  
          return ret