Type Alias SinkTrace 

pub(crate) type SinkTrace = TraceAgent<OrdValSpine<Option<Row>, Row, Timestamp, Diff>>;

The concrete trace type produced internally when arranging a sink’s input. The sink never sees this directly — only the batches flowing through it — but it’s the anchor for the batch type in SinkBatchStream.

Aliased Type

pub(crate) struct SinkTrace { /* private fields */ }