flow::compute::types

Struct CollectionBundle

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pub struct CollectionBundle<T: 'static = (Row, i64, i64)> {
    pub collection: Collection<T>,
    pub arranged: BTreeMap<Vec<ScalarExpr>, Arranged>,
}
Expand description

A bundle of the various ways a collection can be represented.

This type maintains the invariant that it does contain at least one(or both) valid source of data, either a collection or at least one arrangement. This is for convenience of reading the data from the collection.

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§collection: Collection<T>

This is useful for passively reading the new updates from the collection

Invariant: the timestamp of the updates should always not greater than now, since future updates should be stored in the arrangement

§arranged: BTreeMap<Vec<ScalarExpr>, Arranged>

the key ScalarExpr indicate how the keys(also a [Row]) used in Arranged is extract from collection’s [Row] So it is the “index” of the arrangement

The Arranged is the actual data source, it can be used to read the data from the collection by using the key indicated by the Vec<ScalarExpr> There is a false positive in using Vec<ScalarExpr> as key due to ScalarExpr::Literal contain a Value which have bytes variant

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impl<T: 'static> CollectionBundle<T>

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pub fn from_collection(collection: Collection<T>) -> Self

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impl<T: 'static + Clone> CollectionBundle<T>

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pub fn clone(&self, df: &mut Hydroflow<'_>) -> Self

Trait Implementations§

Auto Trait Implementations§

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impl<T> Freeze for CollectionBundle<T>

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impl<T = (Row, i64, i64)> !RefUnwindSafe for CollectionBundle<T>

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impl<T = (Row, i64, i64)> !Send for CollectionBundle<T>

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impl<T = (Row, i64, i64)> !Sync for CollectionBundle<T>

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impl<T> Unpin for CollectionBundle<T>

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impl<T = (Row, i64, i64)> !UnwindSafe for CollectionBundle<T>

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impl<T> Any for T
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fn convert_vec_box(value: Vec<Box<Self>>) -> Vec<Box<T>>

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fn convert_matrix(value: Vec<Vec<Self>>) -> Vec<Vec<T>>

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