Enum ResidualClass 

pub enum ResidualClass {
    PlanRegression,
    Cardinality,
    Contention,
    CacheIo,
    WorkloadPhase,
}

The five residual classes emitted by SQL engines that DSFB-Database structures. Names and definitions match Section 3 (Residual Taxonomy) of the paper.

Variants

PlanRegression

Latency vs rolling baseline; plan-hash transitions.

Cardinality

actual_rows / estimated_rows divergence per plan node or per query.

Contention

Lock-wait depth, blocked-by chain length, queue depth.

CacheIo

Buffer / cache hit-ratio drop with I/O-wait amplification.

WorkloadPhase

Digest-mix entropy and class-distribution drift across query workload.

Implementations

impl ResidualClass

pub const ALL: [ResidualClass; 5]

pub fn name(&self) -> &'static str

Trait Implementations

impl Clone for ResidualClass

fn clone(&self) -> ResidualClass

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResidualClass

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ResidualClass

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for ResidualClass

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ResidualClass

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ResidualClass

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for ResidualClass

impl Eq for ResidualClass

impl StructuralPartialEq for ResidualClass