Struct ExtendedStatistics 

pub struct ExtendedStatistics { /* private fields */ }

Statistics with support for custom extensions.

Wraps the standard Statistics and adds a type-erased extension map for custom statistics like histograms, sketches, or domain-specific metadata.

Example

// Define a custom statistics extension
#[derive(Debug, Clone)]
struct HistogramStats {
    buckets: Vec<(i64, i64, usize)>, // (min, max, count)
}

// Set extension in a planner
let mut stats = ExtendedStatistics::from(base_stats);
stats.set_extension(HistogramStats { buckets: vec![] });

// Retrieve in a consumer
if let Some(hist) = stats.get_extension::<HistogramStats>() {
    // Use histogram for better estimation
}

Implementations

impl ExtendedStatistics

pub fn new(base: Statistics) -> Self

Create new ExtendedStatistics wrapping owned statistics.

pub fn new_arc(base: Arc<Statistics>) -> Self

Create new ExtendedStatistics from an Arc<Statistics>.

pub fn base(&self) -> &Statistics

Returns a reference to the base Statistics.

pub fn base_arc(&self) -> &Arc<Statistics>

Returns a reference to the underlying Arc<Statistics>.

pub fn get_extension<T: 'static + Send + Sync>(&self) -> Option<&T>

Get a reference to a custom statistics extension by type.

pub fn set_extension<T: 'static + Send + Sync>(&mut self, value: T)

Set a custom statistics extension.

pub fn has_extension<T: 'static + Send + Sync>(&self) -> bool

Check if an extension of the given type exists.

pub fn merge_extensions(&mut self, other: &ExtendedStatistics)

Merge extensions from another ExtendedStatistics (other’s extensions take precedence).

Trait Implementations

impl Clone for ExtendedStatistics

fn clone(&self) -> ExtendedStatistics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExtendedStatistics

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

Formats the value using the given formatter.

impl Default for ExtendedStatistics

fn default() -> ExtendedStatistics

Returns the “default value” for a type.

impl From<Arc<Statistics>> for ExtendedStatistics

fn from(base: Arc<Statistics>) -> Self

Converts to this type from the input type.

impl From<ExtendedStatistics> for Statistics

fn from(extended: ExtendedStatistics) -> Self

Converts to this type from the input type.

impl From<Statistics> for ExtendedStatistics

fn from(base: Statistics) -> Self

Converts to this type from the input type.