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TableStats

graphos_engine::query::optimizer::cardinality

Struct TableStats 

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pub struct TableStats {
    pub row_count: u64,
    pub columns: HashMap<String, ColumnStats>,
}
Expand description

Statistics for a table/label.

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§row_count: u64

Total number of rows.

§columns: HashMap<String, ColumnStats>

Column statistics.

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impl TableStats

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pub fn new(row_count: u64) -> Self

Creates new table statistics.

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pub fn with_column(self, name: &str, stats: ColumnStats) -> Self

Adds column statistics.

Trait Implementations§

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impl Clone for TableStats

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fn clone(&self) -> TableStats

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 TableStats

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

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where T: ?Sized,

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fn borrow(&self) -> &T

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

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

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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

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impl<T> Instrument for T

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

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fn into(self) -> U

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impl<T> Pointable for T

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const ALIGN: usize

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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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Dereferences the given pointer. Read more
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Drops the object pointed to by the given pointer. Read more
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where T: Clone,

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type Owned = T

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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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type Error = <U as TryFrom<T>>::Error

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