func (self *Shard) getPointIteratorForSeries(querySpec *parser.QuerySpec, name string, columns []string) ([]string, *PointIterator, error) { fields, err := self.getFieldsForSeries(querySpec.Database(), name, columns) if err != nil { log.Error("Error looking up fields for %s: %s", name, err) return nil, nil, err } startTime := querySpec.GetStartTime() endTime := querySpec.GetEndTime() query := querySpec.SelectQuery() iterators := self.getIterators(fields, startTime, endTime, query.Ascending) pi := NewPointIterator(iterators, fields, querySpec.GetStartTime(), querySpec.GetEndTime(), query.Ascending) columns = make([]string, len(fields)) for i := range fields { columns[i] = fields[i].Name } return columns, pi, nil }