fn mfp_subgraph(
arrange: &ArrangeHandler,
input: impl IntoIterator<Item = (Row, i64, i64)>,
mfp_plan: &MfpPlan,
now: i64,
err_collector: &ErrCollector,
scheduler: &Scheduler,
send: &PortCtx<SEND, TeeingHandoff<(Row, i64, i64)>>,
)