Struct HistogramBucket 

pub struct HistogramBucket {
    pub lower_bound: String,
    pub upper_bound: String,
    pub count: u64,
    pub distinct_count: u64,
    pub null_count: u64,
}

A single bucket in an equi-depth histogram.

All values in the range [lower_bound, upper_bound] (lexicographic) fall into this bucket.

Fields

lower_bound: String

Minimum value in this bucket (inclusive, string-encoded).

upper_bound: String

Maximum value in this bucket (inclusive, string-encoded).

count: u64

Approximate number of values (triples) whose object falls in this bucket.

distinct_count: u64

Approximate number of distinct values in this bucket.

null_count: u64

Number of null / missing values encountered when building this bucket.

Implementations

impl HistogramBucket

pub fn contains(&self, value: &str) -> bool

Returns true if value falls within the closed range [lower_bound, upper_bound].

pub fn overlap_fraction(&self, lo: &str, hi: &str) -> f64

Returns the fraction [0, 1] of the bucket that is “covered” by the closed range [lo, hi]. Used for range selectivity estimation with linear interpolation.

Trait Implementations

impl Clone for HistogramBucket

fn clone(&self) -> HistogramBucket

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HistogramBucket

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

Formats the value using the given formatter.