Struct JoinPredicate 

pub struct JoinPredicate {
    pub left_column: ColumnRef,
    pub right_column: ColumnRef,
    pub eval_type: EvalType,
    pub join_type: JoinType,
}

A join predicate compares columns from two tables.

Fields

left_column: ColumnRef

right_column: ColumnRef

eval_type: EvalType

join_type: JoinType

Implementations

impl JoinPredicate

pub fn new( left_column: ColumnRef, right_column: ColumnRef, eval_type: EvalType, join_type: JoinType, ) -> Self

pub fn inner( left_column: ColumnRef, right_column: ColumnRef, eval_type: EvalType, ) -> Self

pub fn left_outer( left_column: ColumnRef, right_column: ColumnRef, eval_type: EvalType, ) -> Self

pub fn reverse(&self) -> Self

Reverses the join predicate (swaps left and right columns).

pub fn is_equi_join(&self) -> bool

Checks if this is an equi-join (equality comparison).

pub fn eval_rows(&self, left_row: &Row, right_row: &Row) -> bool

Evaluates the join condition for two rows.

Trait Implementations

impl Clone for JoinPredicate

fn clone(&self) -> JoinPredicate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JoinPredicate

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

Formats the value using the given formatter.

impl Predicate for JoinPredicate

fn eval(&self, row: &Row) -> bool

Evaluates the predicate against a row.

fn columns(&self) -> Vec<&ColumnRef>

Returns the columns referenced by this predicate.

fn tables(&self) -> Vec<&str>

Returns the tables referenced by this predicate.