QueryEnd

Marker for the final frame of a successful query stream. Every successful stream sets QueryEnd on exactly one frame, after which no further frames are sent. That frame always carries the final watermark. For ItemLimit, it also carries the final matching item; for every other reason it carries no item. A ScanLimit terminal watermark may repeat the previous frame's cursor when its authoritative scan frontier was already emitted; this does not repeat an item.

A stream that fails or is cancelled terminates with a gRPC status and does not send QueryEnd.