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QueryExecutionFeedback

linkrs_query::optimizer::stats::feedback::query

Struct QueryExecutionFeedback 

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pub struct QueryExecutionFeedback {
Show 13 fields
    pub query_fingerprint: String,
    pub sequence: u64,
    pub space: Option<String>,
    pub estimated_rows: u64,
    pub actual_rows: u64,
    pub estimated_time_us: u64,
    pub actual_time_us: u64,
    pub execution_timestamp: Instant,
    pub apply_rows: u64,
    pub join_rows: u64,
    pub apply_time_us: u64,
    pub join_time_us: u64,
    pub operator_feedbacks: Vec<OperatorFeedback>,

}
Expand description

Query execution feedback

Record the complete feedback information for each query execution.

§Examples

use linkrs_query::optimizer::stats::feedback::query::QueryExecutionFeedback;

let mut feedback = QueryExecutionFeedback::new("query_fp_123".to_string());
feedback.estimated_rows = 1000;
feedback.actual_rows = 1200;
feedback.estimated_time_us = 5000;
feedback.actual_time_us = 6000;

assert!(feedback.row_estimation_error() > 0.0);

Fields§

§query_fingerprint: String

Querying fingerprints

§sequence: u64

Monotonic sequence assigned by [QueryFeedbackHistory] on insert. Lets the fold loop consume each execution exactly once instead of re-applying the whole retained history on every optimization.

§space: Option<String>

Target space name (if any), used to scope selectivity corrections.

§estimated_rows: u64

Estimated number of output lines

§actual_rows: u64

Actual number of output lines

§estimated_time_us: u64

Estimated execution time (microseconds)

§actual_time_us: u64

Actual execution time (microseconds)

§execution_timestamp: Instant

Execution timestamp

§apply_rows: u64

Actual rows produced by Apply-style operators (nested-loop paths).

Populated from the execution profile; used to contrast the nested-loop execution cost of kept PatternApply subqueries against the hash SemiJoin rows of unnested plans.

§join_rows: u64

Actual rows produced by SemiJoin operators (unnested hash paths).

§apply_time_us: u64

Actual time (microseconds) spent in Apply-style operators.

§join_time_us: u64

Actual time (microseconds) spent in SemiJoin operators.

§operator_feedbacks: Vec<OperatorFeedback>

Feedback from each operator

Implementations§

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impl QueryExecutionFeedback

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pub fn new(query_fingerprint: String) -> Self

Create new feedback for query execution.

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pub fn row_estimation_error(&self) -> f64

Estimated error in calculating the number of rows

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pub fn time_estimation_error(&self) -> f64

Calculation time estimation error

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pub fn add_operator_feedback(&mut self, feedback: OperatorFeedback)

Add operator feedback

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pub fn operator_feedback_count(&self) -> usize

Number of operator feedbacks obtained

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pub fn get_operator_feedback( &self, operator_id: &str, ) -> Option<&OperatorFeedback>

Obtaining feedback on a specific operator

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pub fn avg_operator_row_error(&self) -> f64

Calculate the average estimation error for the number of rows of all operators.

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pub fn avg_operator_time_error(&self) -> f64

Calculate the average time estimation error for all operators.

Trait Implementations§

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impl Clone for QueryExecutionFeedback

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for QueryExecutionFeedback

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

Formats the value using the given formatter. Read more

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