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ValueHistogram

linkrs_query::optimizer::stats::histogram

Struct ValueHistogram 

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

Isobathic histogram

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impl ValueHistogram

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pub fn empty() -> Self

Create an empty histogram.

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pub fn from_samples( samples: Vec<Value>, num_buckets: usize, total_count: u64, ) -> Self

Constructing an isobathic histogram from the sampled data

§Parameters

“samples”: A list of sampled values num_buckets: The number of buckets total_count: The total number of records (used to calculate the proportion of null values).

§Description

An isochore plot ensures that each bin contains approximately the same number of samples.

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pub fn estimate_equality_selectivity(&self, value: &Value) -> f64

Estimated equivalence query selectivity

§Description

Find the bucket that contains that value, using the assumption of a uniform distribution within the bucket: 1 / the number of unique values (NDV) in the bucket.

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pub fn estimate_range_selectivity(&self, range: &RangeCondition) -> f64

Selective query within the estimated range

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pub fn bucket_count(&self) -> usize

Obtain the number of buckets

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pub fn null_fraction(&self) -> f64

Obtain the proportion of null values

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pub fn total_count(&self) -> u64

Get the total number of records.

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pub fn distinct_values(&self) -> u64

Obtaining different numbers of values

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pub fn last_updated(&self) -> Instant

Get the last update time.

Trait Implementations§

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impl Clone for ValueHistogram

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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 ValueHistogram

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

Formats the value using the given formatter. Read more

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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