Method write

flow/include/flow/TDMetric.actor.h:408–411

struct FieldValueBlockEncoding {
	FieldValueBlockEncoding() : prev(0) {}
	inline void write(BinaryWriter& w, T v) {
		w << CompressedInt<T>(v - prev);
		prev = v;
	}
	T read(BinaryReader& r) {
		CompressedInt<T> v;
		r >> v;