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QueryExecutionInstance

linkrs_query::executor::streaming::instance

Struct QueryExecutionInstance 

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

A single execution instance of a PhysicalPlan.

Owns the runtime, root memory pool, operator tree, task group, and delivery state for exactly one query invocation. Multiple concurrent executions of the same plan produce separate QueryExecutionInstance values.

Optionally holds a QueryGuard that unregisters the query from the QueryRegistry on drop, ensuring no leaked entries.

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impl QueryExecutionInstance

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pub fn instantiate_plan( plan: Arc<PhysicalPlan>, bindings: QueryBindings, sink: ResultSink, registry: Option<Arc<QueryRegistry>>, query_manager: Option<Arc<QueryManager>>, ) -> Result<Self, QueryError>

Instantiate from a PhysicalPlan arena (sole production path).

Uses PhysicalPlanMaterializer to convert the arena plan into an operator tree, then wraps it with runtime, engine, and sink.

When a QueryRegistry is provided, the query is registered with a unique non-zero ID and the guard is stored in the instance.

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pub fn runtime(&self) -> &Arc<ExecutionRuntime> ⓘ

Return a reference to the execution runtime.

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pub fn output_contract(&self) -> &OutputContract

Return the output contract from the plan.

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pub fn fragment_graph(&self) -> &FragmentGraph

Return the plan’s fragment DAG.

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pub fn execute(&mut self) -> Result<ExecutionResult, QueryError>

Execute and materialize all results.

Valid only when the sink is ResultSink::Materialize. Panics if the sink has a different variant.

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pub fn into_stream(self) -> Result<StreamingQueryResult, QueryError>

Convert to a streaming result handle.

Valid only when the sink is ResultSink::Stream. Panics if the sink has a different variant.

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pub fn execute_discard(&mut self) -> Result<(), QueryError>

Execute with a discard sink (for side-effect-only commands).

Uses streaming internally to avoid materializing results that will be discarded.

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pub fn cancel(&self)

Cancel the running query.

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impl Debug for QueryExecutionInstance

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

Formats the value using the given formatter. Read more

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