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ColumnStats

graphos_engine::query::optimizer::cardinality

Struct ColumnStats 

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pub struct ColumnStats {
    pub distinct_count: u64,
    pub null_count: u64,
    pub min_value: Option<f64>,
    pub max_value: Option<f64>,
}
Expand description

Statistics for a column.

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§distinct_count: u64

Number of distinct values.

§null_count: u64

Number of null values.

§min_value: Option<f64>

Minimum value (if orderable).

§max_value: Option<f64>

Maximum value (if orderable).

Implementations§

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impl ColumnStats

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pub fn new(distinct_count: u64) -> Self

Creates new column statistics.

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pub fn with_nulls(self, null_count: u64) -> Self

Sets the null count.

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pub fn with_range(self, min: f64, max: f64) -> Self

Sets the min/max range.

Trait Implementations§

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impl Clone for ColumnStats

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fn clone(&self) -> ColumnStats

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

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

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

Formats the value using the given formatter. Read more

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

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