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ColumnStatsCache

radixdb_executor::planner

Struct ColumnStatsCache 

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pub struct ColumnStatsCache {
    pub null_count: u64,
    pub distinct_count: u64,
    pub min_value: Option<Value>,
    pub max_value: Option<Value>,
    pub histogram: Option<Histogram>,
}
Expand description

Cached column stats (simplified for internal use)

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§null_count: u64

Number of null values in the column

§distinct_count: u64

Number of distinct values in the column

§min_value: Option<Value>

Minimum value in the column

§max_value: Option<Value>

Maximum value in the column

§histogram: Option<Histogram>

Histogram for range selectivity estimation

Trait Implementations§

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impl Clone for ColumnStatsCache

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fn clone(&self) -> ColumnStatsCache

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<T> Any for T
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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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unsafe fn drop_and_dealloc(ptr: *mut u8)

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fn vzip(self) -> V