Enum DynamicFilterTracking 

pub enum DynamicFilterTracking {
    Static,
    AllComplete,
    Watching(DynamicFilterTracker),
}

Classification of a predicate according to the dynamic filters it contains.

Produced by DynamicFilterTracking::classify with a single tree walk so callers can answer both “is it worth pruning at all?” and “do I need to keep watching?” without traversing the predicate twice.

Variants

Static

The predicate contains no DynamicFilterPhysicalExpr at all. It is fully static and will never change.

AllComplete

The predicate contains one or more dynamic filters, but all of them have already been marked complete. Their current values may differ from what was known at planning time (so a one-shot prune is still worthwhile), but they will not change again — there is nothing to watch.

Watching(DynamicFilterTracker)

The predicate contains at least one dynamic filter that can still change. The embedded DynamicFilterTracker should be polled to detect updates.

Implementations

impl DynamicFilterTracking

pub fn classify(predicate: &Arc<dyn PhysicalExpr>) -> Self

Walk predicate once and classify its dynamic-filter content, subscribing to every filter that is not yet complete.

pub fn contains_dynamic_filter(&self) -> bool

true if the predicate contains any dynamic filter (complete or not), i.e. its value may differ from what was known at planning time and is therefore worth re-evaluating at least once.

pub fn watcher(&mut self) -> Option<&mut DynamicFilterTracker>

Mutable access to the underlying tracker when there is still something to watch.

Trait Implementations

impl Debug for DynamicFilterTracking

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.