Struct MatchClausePlan 

pub struct MatchClausePlan {
    pub optional_group: Option<u32>,
    pub patterns: Vec<PatternPlan>,
    pub predicates: Vec<MatchPredicate>,
}

Fields

optional_group: Option<u32>

The all-or-nothing OPTIONAL block this clause belongs to (R3), or None for a mandatory clause. Whether a clause is optional is exactly optional_group.is_some() (see MatchClausePlan::is_optional) — the single source of truth, never a separate flag the two could drift apart.

Every clause lowered from one OPTIONAL { MATCH …; MATCH … } (or one plain OPTIONAL MATCH …, which is a block of one) shares the same id. The planner left-joins all clauses of one group as a SINGLE unit (it must NOT join them one inner clause at a time), so a block matches all-or-nothing; distinct ids on adjacent optional clauses mean they chain left-to-right as independent left-joins. The id is an opaque, per-query dense counter (group order == textual order); only equality is meaningful.

patterns: Vec<PatternPlan>

predicates: Vec<MatchPredicate>

Clause-owned NNF conjuncts.

Implementations

impl MatchClausePlan

pub fn is_optional(&self) -> bool

Whether this clause is the body of an OPTIONAL operand (a left-outer join against the accumulated binding table, R3) — exactly when it carries an MatchClausePlan::optional_group id.

Trait Implementations

impl Clone for MatchClausePlan

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MatchClausePlan

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

Formats the value using the given formatter.

impl Eq for MatchClausePlan

impl Hash for MatchClausePlan

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 MatchClausePlan

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for MatchClausePlan