// CreateIterator returns an iterator for the data in the shard.
func (s *Shard) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
if err := s.ready(); err != nil {
return nil, err
}
if influxql.Sources(opt.Sources).HasSystemSource() {
return s.createSystemIterator(opt)
}
opt.Sources = influxql.Sources(opt.Sources).Filter(s.database, s.retentionPolicy)
return s.engine.CreateIterator(opt)
}
// CreateIterator returns an iterator for the data in the shard.
func (s *Shard) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
if s.closed() {
return nil, ErrEngineClosed
}
if influxql.Sources(opt.Sources).HasSystemSource() {
return s.createSystemIterator(opt)
}
opt.Sources = influxql.Sources(opt.Sources).Filter(s.database, s.retentionPolicy)
return s.engine.CreateIterator(opt)
}