Enum ExecutionStrategy 

pub enum ExecutionStrategy {
    IndexPushdown,
    StreamingTopK,
    FullSort,
}

Strategy for ORDER BY + LIMIT execution

Variants

IndexPushdown

Use index pushdown (storage provides ordered results)

StreamingTopK

Streaming top-K with heap

FullSort

Full sort then limit

Implementations

impl ExecutionStrategy

pub fn choose( has_matching_index: bool, estimated_rows: Option<usize>, limit: usize, ) -> Self

Choose the optimal strategy

pub fn complexity(&self, n: usize, k: usize) -> String

Get estimated complexity description

Trait Implementations

impl Clone for ExecutionStrategy

fn clone(&self) -> ExecutionStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExecutionStrategy

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

Formats the value using the given formatter.

impl PartialEq for ExecutionStrategy

fn eq(&self, other: &ExecutionStrategy) -> 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 Copy for ExecutionStrategy

impl Eq for ExecutionStrategy

impl StructuralPartialEq for ExecutionStrategy