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type ExprField struct {
	FieldAlias string
	Expr       expression.Expr
}

type Field interface {
	Include() bool
	Alias() string
	GetJSONAlias() []byte
	Apply(map[string]*JSONObject) ([]byte, error)
}

type FieldFactory struct {
	Exclude       map[string]Field
	Include       map[string]Field
	FetchedValues map[string]*JSONObject
}

type JSONObject struct {
	Key      []byte
	Value    []byte
	DataType jsonparser.ValueType
}

type SimpleField struct {
	Name string
	Incl bool
}