Enum ExecutionStrategy 

#[non_exhaustive]
pub enum ExecutionStrategy {
    VectorFirst,
    GraphFirst,
    Parallel,
}

Execution strategy for hybrid queries.

This is the planner’s intent; the executor realizes it only partially: on the SELECT path (execution_paths.rs), GraphFirst selects a full-scan-then-score realization for metadata filters and every other variant (including Parallel) is executed as VectorFirst. Graph predicates in SELECT WHERE that are AND-required take the GraphFirst anchored fetch (graph_prefilter.rs) independently of this strategy — anchor sets are evaluated first and retrieval is exhaustive within them; only OR/NOT-wrapped predicates remain post-filters over the fetch window. On the top-level MATCH path (match_dispatch.rs), Parallel runs GraphFirst and VectorFirst sequentially and merges the result sets (true parallelism is a future optimization).

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

VectorFirst

Execute vector search first, then filter by graph pattern. Best when graph filter is not very selective (>10% of data).

GraphFirst

Intended: execute graph pattern first, then vector search on candidates (selective filters, <1% of data). Realized on the SELECT path as a full scan scored by vector similarity for metadata filters; not realized for SELECT graph predicates (post-filter applies).

Parallel

Intended: execute both sides in parallel and merge (medium selectivity, 1-10%). Realized as VectorFirst on the SELECT path and as sequential GraphFirst + VectorFirst with a merge on the MATCH path.

Trait Implementations

impl Clone for ExecutionStrategy

fn clone(&self) -> ExecutionStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ExecutionStrategy

impl Debug for ExecutionStrategy

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

Formats the value using the given formatter.

impl Eq for ExecutionStrategy

impl PartialEq for ExecutionStrategy

fn eq(&self, other: &ExecutionStrategy) -> 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 StructuralPartialEq for ExecutionStrategy