code: func (s *DropSeriesStatement) String() string {
  	var buf bytes.Buffer
  	buf.WriteString("DROP SERIES")
  
  	if s.Sources != nil {
  		buf.WriteString(" FROM ")
  		buf.WriteString(s.Sources.String())
  	}
  	if s.Condition != nil {
  		buf.WriteString(" WHERE ")
  		buf.WriteString(s.Condition.String())
  	}
  
  	return buf.String()
  }
docs: // String returns a string representation of the drop series statement.