Struct TierCapacity 

pub struct TierCapacity {
    pub device_bytes: Option<u64>,
    pub host_bytes: Option<u64>,
    pub spill_on_query_path: bool,
}

What the engine knows about the size of each memory tier, and whether anything on the query path fills them (#25).

None is “this engine has no number”, which is different from zero and different from a plausible constant. The gauges used to be drawn against fixed reference capacities, which made a dashboard that looked like a bounded memory model over an engine that had none.

Fields

device_bytes: Option<u64>

Device memory the local backend reports, when it drives a device.

host_bytes: Option<u64>

Host memory the local backend reports.

spill_on_query_path: bool

Whether a crate::telemetry::SpillCounters writer is on the query path. false means the tier gauges and spill counters below can only be moved by a caller using the spill manager as a library — no query registers a batch with it — so a reading of zero says nothing about the query’s memory use.

Trait Implementations

impl Clone for TierCapacity

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for TierCapacity

impl Debug for TierCapacity

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

Formats the value using the given formatter.

impl Default for TierCapacity

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TierCapacity

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for TierCapacity

impl PartialEq for TierCapacity

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for TierCapacity

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TierCapacity