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
}