field

type Expression interface {
	// Bytes returns a byte slice representing the expression resolved for a
	// message
	// of a batch.
	Bytes(index int, msg Message) []byte

	// BytesLegacy is DEPRECATED - Instructs deprecated functions to disregard
	// index information.
	// TODO V4: Remove this.
	BytesLegacy(index int, msg Message) []byte

	// BytesEscaped returns a byte slice representing the expression resolved
	// for a message of a batch with the contents of resolved expressions
	// escaped.
	BytesEscaped(index int, msg Message) []byte

	// BytesEscapedLegacy is DEPRECATED - Instructs deprecated functions to
	// disregard index information.
	// TODO V4: Remove this.
	BytesEscapedLegacy(index int, msg Message) []byte

	// String returns a string representing the expression resolved for a
	// message of a batch.
	String(index int, msg Message) string

	// StringLegacy is DEPRECATED - Instructs deprecated functions to disregard
	// index information.
	// TODO V4: Remove this.
	StringLegacy(index int, msg Message) string
}

type Message interface {
	Get(p int) types.Part
	Len() int
}