Enum ActivationBudget 

enum ActivationBudget {
    Unbounded,
    Bounded {
        per_peek: usize,
        remaining: usize,
    },
}

The fuel an activation may spend walking index peeks on the worker, and what one peek may take of it.

The per-peek budget decides placement: a peek that outruns it moves off the worker. The aggregate exists because the sweep visits every pending peek, so a per-peek budget alone would let N peeks cost N times that budget in one pass.

Both count cursor positions, the unit the scan charges.

Variants

Unbounded

Every peek walks on the worker until it answers or until its rows belong in the peek stash, and nothing is passed over.

What the kill switch restores. A stash-bound peek still offloads, because the driver that writes to the stash is the offloaded one, so this restores where an ordinary peek runs and not a guarantee that none leaves the worker.

Bounded

A peek may spend per_peek before it is offloaded, and all peeks together may spend remaining before the rest of this activation’s work gets the worker back.

Fields

per_peek: usize

remaining: usize