Trait mz_timely_util::operator::CollectionExt

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pub trait CollectionExt<G, D1, R>
where
    G: Scope,
    R: Semigroup,
{
    // Required methods
    fn empty(scope: &G) -> Collection<G, D1, R>;
    fn flat_map_fallible<D2, E, I, L>(
        &self,
        name: &str,
        logic: L
    ) -> (Collection<G, D2, R>, Collection<G, E, R>)
       where D2: Data,
             E: Data,
             I: IntoIterator<Item = Result<D2, E>>,
             L: FnMut(D1) -> I + 'static;
    fn explode_one<D2, R2, L>(
        &self,
        logic: L
    ) -> Collection<G, D2, <R2 as Multiply<R>>::Output>
       where D2: Data,
             R2: Semigroup + Multiply<R>,
             <R2 as Multiply<R>>::Output: Data + Semigroup,
             L: FnMut(D1) -> (D2, R2) + 'static,
             G::Timestamp: Lattice;
    fn ensure_monotonic<E, IE>(
        &self,
        into_err: IE
    ) -> (Collection<G, D1, R>, Collection<G, E, R>)
       where E: Data,
             IE: Fn(D1, R) -> (E, R) + 'static,
             R: Signed;
    fn with_token(&self, token: Weak<()>) -> Collection<G, D1, R>;
    fn consolidate_named_if<Ba>(
        self,
        must_consolidate: bool,
        name: &str
    ) -> Self
       where D1: ExchangeData + Hash,
             R: Semigroup + ExchangeData,
             G::Timestamp: Lattice,
             Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static;
    fn consolidate_named<Ba>(self, name: &str) -> Self
       where D1: ExchangeData + Hash,
             R: Semigroup + ExchangeData,
             G::Timestamp: Lattice,
             Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static;

    // Provided method
    fn map_fallible<D2, E, L>(
        &self,
        name: &str,
        logic: L
    ) -> (Collection<G, D2, R>, Collection<G, E, R>)
       where D2: Data,
             E: Data,
             L: FnMut(D1) -> Result<D2, E> + 'static { ... }
}
Expand description

Extension methods for differential Collections.

Required Methods§

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fn empty(scope: &G) -> Collection<G, D1, R>

Creates a new empty collection in scope.

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fn flat_map_fallible<D2, E, I, L>( &self, name: &str, logic: L ) -> (Collection<G, D2, R>, Collection<G, E, R>)
where D2: Data, E: Data, I: IntoIterator<Item = Result<D2, E>>, L: FnMut(D1) -> I + 'static,

Like Collection::flat_map, but logic is allowed to fail. The first returned collection will contain the successful applications of logic, while the second returned collection will contain the failed applications.

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fn explode_one<D2, R2, L>( &self, logic: L ) -> Collection<G, D2, <R2 as Multiply<R>>::Output>
where D2: Data, R2: Semigroup + Multiply<R>, <R2 as Multiply<R>>::Output: Data + Semigroup, L: FnMut(D1) -> (D2, R2) + 'static, G::Timestamp: Lattice,

Replaces each record with another, with a new difference type.

This method is most commonly used to take records containing aggregatable data (e.g. numbers to be summed) and move the data into the difference component. This will allow differential dataflow to update in-place.

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fn ensure_monotonic<E, IE>( &self, into_err: IE ) -> (Collection<G, D1, R>, Collection<G, E, R>)
where E: Data, IE: Fn(D1, R) -> (E, R) + 'static, R: Signed,

Partitions the input into a monotonic collection and non-monotone exceptions, with respect to differences.

The exceptions are transformed by into_err.

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fn with_token(&self, token: Weak<()>) -> Collection<G, D1, R>

Wraps the collection with an operator that passes through all received inputs as long as the provided token can be upgraded. Once the token cannot be upgraded anymore, all data flowing into the operator is dropped.

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fn consolidate_named_if<Ba>(self, must_consolidate: bool, name: &str) -> Self
where D1: ExchangeData + Hash, R: Semigroup + ExchangeData, G::Timestamp: Lattice, Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static,

Consolidates the collection if must_consolidate is true and leaves it untouched otherwise.

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fn consolidate_named<Ba>(self, name: &str) -> Self
where D1: ExchangeData + Hash, R: Semigroup + ExchangeData, G::Timestamp: Lattice, Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static,

Consolidates the collection.

Provided Methods§

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fn map_fallible<D2, E, L>( &self, name: &str, logic: L ) -> (Collection<G, D2, R>, Collection<G, E, R>)
where D2: Data, E: Data, L: FnMut(D1) -> Result<D2, E> + 'static,

Like Collection::map, but logic is allowed to fail. The first returned collection will contain successful applications of logic, while the second returned collection will contain the failed applications.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl<G, D1, R> CollectionExt<G, D1, R> for Collection<G, D1, R>
where G: Scope, G::Timestamp: Data, D1: Data, R: Semigroup,

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fn empty(scope: &G) -> Collection<G, D1, R>

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fn flat_map_fallible<D2, E, I, L>( &self, name: &str, logic: L ) -> (Collection<G, D2, R>, Collection<G, E, R>)
where D2: Data, E: Data, I: IntoIterator<Item = Result<D2, E>>, L: FnMut(D1) -> I + 'static,

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fn explode_one<D2, R2, L>( &self, logic: L ) -> Collection<G, D2, <R2 as Multiply<R>>::Output>
where D2: Data, R2: Semigroup + Multiply<R>, <R2 as Multiply<R>>::Output: Data + Semigroup, L: FnMut(D1) -> (D2, R2) + 'static, G::Timestamp: Lattice,

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fn ensure_monotonic<E, IE>( &self, into_err: IE ) -> (Collection<G, D1, R>, Collection<G, E, R>)
where E: Data, IE: Fn(D1, R) -> (E, R) + 'static, R: Signed,

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fn with_token(&self, token: Weak<()>) -> Collection<G, D1, R>

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fn consolidate_named_if<Ba>(self, must_consolidate: bool, name: &str) -> Self
where D1: ExchangeData + Hash, R: Semigroup + ExchangeData, G::Timestamp: Lattice + Ord, Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static,

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fn consolidate_named<Ba>(self, name: &str) -> Self
where D1: ExchangeData + Hash, R: Semigroup + ExchangeData, G::Timestamp: Lattice + Ord, Ba: Batcher<Input = Vec<((D1, ()), G::Timestamp, R)>, Output = ((D1, ()), G::Timestamp, R), Time = G::Timestamp> + 'static,

Implementors§