//	<BytesProcessed>1024</BytesProcessed>
//	<BytesReturned>1024</BytesReturned>
//
// </Progress>
func newProgressMessage(bytesScanned, bytesProcessed, bytesReturned int64) []byte {
	payload := []byte(`<?xml version="1.0" encoding="UTF-8"?><Progress><BytesScanned>` +
		strconv.FormatInt(bytesScanned, 10) + `</BytesScanned><BytesProcessed>` +
		strconv.FormatInt(bytesProcessed, 10) + `</BytesProcessed><BytesReturned>` +

	case jsonFormat:
		return json.NewRecord(sql.SelectFmtJSON)
	}

	panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
}

func (s3Select *S3Select) getProgress() (bytesScanned, bytesProcessed int64) {
	if s3Select.progressReader != nil {
		return s3Select.progressReader.Stats()
	}

	return -1, -1
}

// Open - opens S3 object by using callback for SQL selection query.