KeyArrayCache

datafusion_common::scalar::cache

Struct KeyArrayCache 

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struct KeyArrayCache<K: ArrowDictionaryKeyType> {
    cache: Option<(usize, bool, PrimitiveArray<K>)>,
}
Expand description

Cache for dictionary key arrays to avoid repeated allocations when the same size is used frequently.

Similar to PartitionColumnProjector’s ZeroBufferGenerators, this cache stores key arrays for different dictionary key types. The cache is limited to 1 entry per type (the last size used) to prevent memory leaks for extremely large array requests.

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§cache: Option<(usize, bool, PrimitiveArray<K>)>

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impl<K: ArrowDictionaryKeyType> KeyArrayCache<K>

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fn get_or_create(&mut self, num_rows: usize, is_null: bool) -> PrimitiveArray<K>

Get or create a cached key array for the given number of rows and null status

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fn create_key_array(&self, num_rows: usize, is_null: bool) -> PrimitiveArray<K>

Create a new key array with the specified number of rows and null status

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impl<K: Debug + ArrowDictionaryKeyType> Debug for KeyArrayCache<K>

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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<K: ArrowDictionaryKeyType> Default for KeyArrayCache<K>

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fn default() -> Self

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

Auto Trait Implementations§

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impl<K> Freeze for KeyArrayCache<K>

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impl<K> RefUnwindSafe for KeyArrayCache<K>
where <K as ArrowPrimitiveType>::Native: RefUnwindSafe,

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impl<K> Send for KeyArrayCache<K>

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impl<K> Sync for KeyArrayCache<K>

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impl<K> Unpin for KeyArrayCache<K>
where <K as ArrowPrimitiveType>::Native: Unpin,

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impl<K> UnwindSafe for KeyArrayCache<K>
where <K as ArrowPrimitiveType>::Native: UnwindSafe,

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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> 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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where U: From<T>,

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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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where T: ?Sized,

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fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns [Action::Follow] only if self and other return Action::Follow. Read more
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where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns [Action::Follow] if either self or other returns Action::Follow. Read more
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type Output = T

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