Struct PartitionStats

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pub struct PartitionStats {
    pub row_count: usize,
    pub min_value: i64,
    pub max_value: i64,
    pub null_count: usize,
    pub distinct_count: usize,
}

Expand description

파티션별 통계 정보 — 쿼리 옵티마이저에 활용

§사용 예

use dbx_core::storage::partition::PartitionStats;
let stats = PartitionStats {
    row_count: 1000,
    min_value: 0,
    max_value: 999,
    null_count: 5,
    distinct_count: 990,
};
assert_eq!(stats.row_count, 1000);

Fields§

§row_count: usize

파티션 내 총 행 수

§min_value: i64

파티션 키의 최솟값

§max_value: i64

파티션 키의 최댓값

§null_count: usize

파티션 키의 NULL 수

§distinct_count: usize

파티션 키의 고유값 수 (Distinct count)

Trait Implementations§

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impl Clone for PartitionStats

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fn clone(&self) -> PartitionStats

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 PartitionStats

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

Formats the value using the given formatter. Read more

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impl Default for PartitionStats

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fn default() -> PartitionStats

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for PartitionStats

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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

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

Performs copy-assignment from self to dest. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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