imports.go
func (v FieldValue) Less(other Record) bool {
	if ov, ok := other.(FieldValue); ok {
		return v.ColumnID < ov.ColumnID
	}
	return false
}
func (v FieldValue) Less(other Record) bool {
	if ov, ok := other.(FieldValue); ok {
		return v.ColumnID < ov.ColumnID
	}
	return false
}
// Less returns true if this field value sorts before the given Record.