Struct JoinEdge 

pub struct JoinEdge {
    pub lhs_table: TableId,
    pub rhs_table: TableId,
    pub lhs_join_col: ColId,
    pub rhs_join_col: ColId,
    pub rhs_col: ColId,
}

A join edge is used for pruning queries when evaluating subscription updates.

If we have the following subscriptions:

SELECT a.* FROM a JOIN b ON a.id = b.id WHERE b.x = 1
SELECT a.* FROM a JOIN b ON a.id = b.id WHERE b.x = 2
...
SELECT a.* FROM a JOIN b ON a.id = b.id WHERE b.x = n

Whenever a is updated, only the relevant queries are evaluated.

Fields

lhs_table: TableId

The TableId for a

rhs_table: TableId

The TableId for b

lhs_join_col: ColId

The ColId for a.id

rhs_join_col: ColId

The ColId for b.id

rhs_col: ColId

The ColId for b.x

Implementations

impl JoinEdge

pub fn range_for_table(lhs_table: TableId) -> impl RangeBounds<Self>

A helper method for finding a range of join edges for a particular table in a sorted set.

Trait Implementations

impl Debug for JoinEdge

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

Formats the value using the given formatter.

impl Ord for JoinEdge

fn cmp(&self, other: &JoinEdge) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for JoinEdge

fn eq(&self, other: &JoinEdge) -> 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 PartialOrd for JoinEdge

fn partial_cmp(&self, other: &JoinEdge) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for JoinEdge

impl StructuralPartialEq for JoinEdge