docs: def _payload_builder(self, query, format=None):
          '''Build the payload'''
          if self.community :
              query = self.COMMUNITY_DATA + query # access to community data tables
  
          if vars(self).get('yql_table_url') : # Attribute only defined when MYQL.use has been called before
              query = "use '{0}' as {1}; ".format(self.yql_table_url, self.yql_table_name) + query
  
          if vars(self).get('_func'): # if post query function filters
              query = '| '.join((query, self._func))
  
          self._query = query        
          
          self._query = self._add_limit()
          self._query = self._add_offset()
  
          logger.info("QUERY = %s" %(self._query,))
  
          payload = {
              'q': self._query,
              'callback': '',#This is not javascript
              'diagnostics': self.diagnostics,
              'format': format if format else self.format,
              'debug': self.debug,
              'jsonCompact': 'new' if self.jsonCompact else ''
          }
  
          if vars(self).get('_vars'):
              payload.update(self._vars)
  
          if self.crossProduct:
              payload['crossProduct'] = 'optimized'
  
          self._payload = payload
          logger.info("PAYLOAD = %s " %(payload, ))
  
          return payload