Enum BuildSide 

pub enum BuildSide {
    Right,
    Left,
}

Which input of a join is gathered whole before the other one starts.

A join is two inputs and a dependency edge between them: one side is finished and held, and then the other side’s rows are matched against what was held. This says which side that is. It is where the hash table goes when the hash join in #62 lands, and it is the side today’s nested loop turns into chunks and rescans once per row of the other one.

Which side that should be is not a property of the join and is not decided here. It is decided by sides from a cardinality estimate, and the rule it uses belongs to whichever operator is reading this, not to the flag.

Variants

Right

The right input, which is what the binder emits and what every join did before this existed.

Left

The left input, which means the executor swaps the two and puts the answer back in order.

Implementations

impl BuildSide

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

The spelling used in the textual form.

Trait Implementations

impl Clone for BuildSide

fn clone(&self) -> BuildSide

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BuildSide

impl Debug for BuildSide

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

Formats the value using the given formatter.

impl Default for BuildSide

fn default() -> BuildSide

Returns the “default value” for a type.

impl Eq for BuildSide

impl Hash for BuildSide

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 BuildSide

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BuildSide