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JoinOrderEnumerator

linkrs_query::planning::join_order::plan_join_order

Struct JoinOrderEnumerator 

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pub struct JoinOrderEnumerator { /* private fields */ }
Expand description

DP join order enumerator.

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impl JoinOrderEnumerator

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pub fn new() -> Self

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pub fn with_space(self, space_id: u64, space_name: impl Into<String>) -> Self

Space the base scans belong to.

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pub fn with_stats(self, stats: JoinOrderStats) -> Self

Attach real cardinality statistics to the estimator.

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pub fn context(&self) -> &JoinOrderEnumeratorContext

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pub fn plan_query_graph( &mut self, query_graph: &Arc<QueryGraph>, ) -> Option<LogicalNodeEnum>

Enumerate the join order for a query graph and return the cheapest plan covering every node and rel, if one exists.

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pub fn plan_with_hint( &mut self, query_graph: &Arc<QueryGraph>, hint: &JoinHint, ) -> Result<LogicalNodeEnum, JoinHintError>

Plan a query graph following a user join hint.

The hint is resolved to a JoinTree and then solved bottom-up against the enumerated DP table: leaf scans reuse the cheapest covering entry (a rel scan prefers the rel-plus-endpoints plan), binary nodes become hash joins on the shared nodes, and multi-way nodes become WcoIntersect via append_intersect. Hints normally arrive from USING JOIN clauses; see JoinHint::from_ast.

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impl Debug for JoinOrderEnumerator

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

Formats the value using the given formatter. Read more
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impl Default for JoinOrderEnumerator

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fn default() -> Self

Returns the “default value” for a type. Read more

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