if chk := field.TagSettings["CHECK"]; chk != "" {
			names := strings.Split(chk, ",")
			if len(names) > 1 && regEnLetterAndMidline.MatchString(names[0]) {
				checks[names[0]] = CheckConstraint{Name: names[0], Constraint: strings.Join(names[1:], ","), Field: field}
			} else {
				if names[0] == "" {
					chk = strings.Join(names[1:], ",")
				}
				name := schema.namer.CheckerName(schema.Table, field.DBName)

		return false
	})

	for _, c := range cs {
		// show warning message the callback name already exists
		if idx := getRIndex(names, c.name); idx > -1 && !c.replace && !c.remove && !cs[idx].remove {
			c.processor.db.Logger.Warn(context.Background(), "duplicated callback `%s` from %s\n", c.name, utils.FileWithLineNum())
		}
		names = append(names, c.name)
	}

	sortCallback = func(c *callback) error {

						}
					} else if names := utils.SplitNestedRelationName(column); len(names) > 1 { // has nested relation
						if rel, ok := sch.Relationships.Relations[names[0]]; ok {
							subNameCount := len(names)
							// nested relation fields
							relFields := make([]*schema.Field, 0, subNameCount-1)
							relFields = append(relFields, rel.Field)
							for _, name := range names[1 : subNameCount-1] {

	for i, entry := range m {
		if entry.name != "" {
			n++
			if first == nil {
				first = &m[i]
			}
		}
	}
	return first, n
}

// names will return all names in order.
// Since this allocates it should not be used in critical functions.
func (m metaCacheEntries) names() []string {
	res := make([]string, 0, len(m))
	for _, obj := range m {

		if err != nil {
			log.Fatal(err)
		}
		if strings.HasSuffix(path, ".zip") {
			log.Fatalf("unexpected file during walk: %s", path)
		}
		name := filepath.ToSlash(path)
		w, err := zw.CreateRaw(&zip.FileHeader{
			Name:               name,
			Method:             zip.Store,
			CompressedSize64:   uint64(len(data)),
			UncompressedSize64: uint64(len(data)),
			CRC32:              crc32.ChecksumIEEE(data),
		})

				metadata = append(metadata, object.UserDefined)
				buckets = append(buckets, object.Bucket)
				names = append(names, object.Name)
			}
		}

		// If there are no SSE-S3 single-part objects
		// we can skip the decryption process. However,
		// we still have to adjust the size and ETag
		// of SSE-C and SSE-KMS objects.
		if len(SSES3SinglePartObjects) == 0 {
			for i := range batch {

	// to return object name invalid rather than
	// a cryptic error from the file system.
	return !strings.ContainsRune(object, 0)
}

// checkObjectNameForLengthAndSlash -check for the validity of object name length and prefis as slash
func checkObjectNameForLengthAndSlash(bucket, object string) error {
	// Check for the length of object name
	if len(object) > 1024 {
		return ObjectNameTooLong{

	return
}

// Group specify the group method on the find
//
//	// Select the sum age of users with given names
//	db.Model(&User{}).Select("name, sum(age) as total").Group("name").Find(&results)
func (db *DB) Group(name string) (tx *DB) {
	tx = db.getInstance()

	fields := strings.FieldsFunc(name, utils.IsValidDBNameChar)

		return []Name{
			ObjectManyVersions,
			ObjectLargeVersions,
			PrefixManyFolders,
		}
	case Everything:
		res := make([]Name, objectSingleTypesEnd-1)
		for i := range res {
			res[i] = Name(i + 1)
		}
		return res
	default:
		return []Name{name}
	}
}

// Mask returns the type as mask.
// Compound "All" types are expanded.
func (name Name) Mask() uint64 {

// metricDisplay - contains info on a metric for display purposes.
type metricDisplay struct {
	Name   string   `json:"name"`
	Help   string   `json:"help"`
	Type   string   `json:"type"`
	Labels []string `json:"labels"`
}

func (md metricDisplay) String() string {
	return fmt.Sprintf("Name: %s\nType: %s\nHelp: %s\nLabels: {%s}\n", md.Name, md.Type, md.Help, strings.Join(md.Labels, ","))
}

func (md metricDisplay) TableRow() string {