Collect

How it fits

Typical backends

Caveats

• I/O contractA list is emitted only when the gate transitions from true to false; while the gate stays true the buffer keeps growing and nothing is emitted.
• Parameter interactionBy default an empty window emits nothing, but allowing empty lists makes the component emit an empty [t] on a window that collected no items, which downstream consumers must then handle.
• State lifetimeThe buffer is in-memory and unbounded by default; an optional size cap force-emits the list once it reaches that many items to keep memory bounded on open-ended runs.
• OrderingItems appear in the emitted list in arrival order, so the batch preserves the upstream sequence within each window.