Struct FeedbackCache 

pub struct FeedbackCache { /* private fields */ }

Cache for cardinality feedback entries

Implementations

impl FeedbackCache

pub fn new() -> Self

Create a new feedback cache with default settings

pub fn with_settings(decay_factor: f64, max_entries: usize) -> Self

Create a cache with custom settings

pub fn record_feedback( &self, table_name: &str, predicate_hash: u64, column_name: Option<String>, estimated_rows: u64, actual_rows: u64, )

Record cardinality feedback for a predicate

pub fn lookup( &self, table_name: &str, predicate_hash: u64, ) -> Option<CardinalityFeedback>

Look up feedback for a predicate pattern

pub fn get_correction(&self, table_name: &str, predicate_hash: u64) -> f64

Get correction factor for a predicate, returns 1.0 if no feedback

pub fn apply_correction( &self, table_name: &str, predicate_hash: u64, estimate: u64, ) -> u64

Apply correction to an estimate

pub fn clear(&self)

Clear all feedback entries

pub fn invalidate_table(&self, table_name: &str)

Remove all learned corrections for a table after data or schema change.

pub fn len(&self) -> usize

Get the number of feedback entries

pub fn is_empty(&self) -> bool

Check if cache is empty

pub fn get_table_feedback(&self, table_name: &str) -> Vec<CardinalityFeedback>

Get all feedback entries for a table

Trait Implementations

impl Debug for FeedbackCache

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

Formats the value using the given formatter.

impl Default for FeedbackCache

fn default() -> Self

Returns the “default value” for a type.