Enum JoinStrategy 

pub enum JoinStrategy {
    Hash,
    NestedLoop,
    SortMerge,
    IndexNestedLoop,
}

Join execution strategy

Variants

Hash

Hash join - build hash table on right, probe with left

NestedLoop

Nested loop join - for small right tables

SortMerge

Sort-merge join - for pre-sorted data

IndexNestedLoop

Index nested loop - use existing index

Implementations

impl JoinStrategy

pub fn select( _left_rows: u64, right_rows: u64, pre_sorted: Option<bool>, _stats: &QueryStatistics, ) -> Self

Select optimal join strategy based on table sizes and data characteristics

Trait Implementations

impl Clone for JoinStrategy

fn clone(&self) -> JoinStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for JoinStrategy

impl Debug for JoinStrategy

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

Formats the value using the given formatter.

impl Eq for JoinStrategy

impl PartialEq for JoinStrategy

fn eq(&self, other: &JoinStrategy) -> 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 StructuralPartialEq for JoinStrategy