Struct mz_sql::plan::lowering::OnPredicates
source · struct OnPredicates {
predicates: Vec<OnPredicate>,
oa: usize,
}
Expand description
A struct that represents the predicates in the on
clause in a form
suitable for efficient planning outer joins with equijoin predicates.
Fields§
§predicates: Vec<OnPredicate>
A store for classified ON
predicates.
Predicates that reference a single side are adjusted to assume an
outer × <side>
schema.
oa: usize
Number of outer context columns.
Implementations§
source§impl OnPredicates
impl OnPredicates
const I_OUT: usize = 0usize
const I_LHS: usize = 1usize
const I_RHS: usize = 2usize
const I_SUB: usize = 3usize
sourcefn new(
oa: usize,
la: usize,
ra: usize,
sa: usize,
on: Vec<MirScalarExpr>,
context: &Context<'_>,
) -> Self
fn new( oa: usize, la: usize, ra: usize, sa: usize, on: Vec<MirScalarExpr>, context: &Context<'_>, ) -> Self
Classify the predicates in the on
clause of an outer join.
The other parameters are arities of the input parts:
oa
is the arity of theouter
context.la
is the arity of theleft
input.ra
is the arity of theright
input.sa
is the arity of theon
subqueries.
The constructor assumes that:
- The
on
parameter will be applied on a result that has the following schemaouter × left × right × on_subqueries
. - The
on
parameter is already adjusted to assume that schema. - The
on
parameter is obtained by canonicalizing the originalon: MirScalarExpr
withcanonicalize_predicates
.
sourcefn is_equijoin(&self, context: &Context<'_>) -> bool
fn is_equijoin(&self, context: &Context<'_>) -> bool
Check if the predicates can be lowered with an equijoin-based strategy.
sourcefn join_keys(&self) -> JoinKeys
fn join_keys(&self) -> JoinKeys
Return an MirRelationExpr
list that represents the keys for the
equijoin. The list will contain the outer columns as a prefix.
sourcefn eq_lhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
fn eq_lhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
Return an iterator over the left-hand sides of all OnPredicate::Eq
conditions in the predicates list.
The iterator will start with column references to the outer columns as a prefix.
sourcefn eq_rhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
fn eq_rhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
Return an iterator over the right-hand sides of all OnPredicate::Eq
conditions in the predicates list.
The iterator will start with column references to the outer columns as a prefix.
sourcefn lhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
fn lhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
Return an iterator over the OnPredicate::Lhs
, OnPredicate::LhsConsequence
and
OnPredicate::Const
conditions in the predicates list.
sourcefn rhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
fn rhs(&self) -> impl Iterator<Item = MirScalarExpr> + '_
Return an iterator over the OnPredicate::Rhs
, OnPredicate::RhsConsequence
and
OnPredicate::Const
conditions in the predicates list.
Auto Trait Implementations§
impl Freeze for OnPredicates
impl RefUnwindSafe for OnPredicates
impl Send for OnPredicates
impl Sync for OnPredicates
impl Unpin for OnPredicates
impl UnwindSafe for OnPredicates
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