Struct RuntimeRangeHint

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pub struct RuntimeRangeHint {
    pub column: PlSmallStr,
    pub order_keeping_expr: Option<Arc<dyn ColumnIoExpr>>,
    pub source: Arc<dyn DynamicPredicateSource>,
    pub constant: Option<Scalar>,
}

Expand description

A column whose batches a reader may skip by a RuntimeRange. It is never evaluated per row.

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§column: PlSmallStr§order_keeping_expr: Option<Arc<dyn ColumnIoExpr>>

An order-keeping expression of column that the range is on. The range is on the column itself when None.

§source: Arc<dyn DynamicPredicateSource>§constant: Option<Scalar>

The value the range is compared with in this file when the column is not stored in the file, such as a hive column or a missing column with a default.

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impl RuntimeRangeHint

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pub fn constant_matches(range: &RuntimeRange, value: &Scalar) -> Option<bool>

Whether a file whose column is the constant value can hold a match. None when the range does not settle it.

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pub fn set_constant(hints: &mut [Self], name: &str, value: &Scalar)

Bind the hints of column name to its constant value in a file.

Trait Implementations§

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impl Clone for RuntimeRangeHint

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fn clone(&self) -> RuntimeRangeHint

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

Auto Trait Implementations§

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impl UnsafeUnpin for RuntimeRangeHint

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<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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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> DynClone for T
where T: Clone,

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fn __clone_box(&self, _: Private) -> *mut ()

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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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