fn render_reduce_plan<G, T>(
    plan: ReducePlan,
    collection: Collection<G, (Row, Row)>,
    err_input: Collection<G, DataflowError>,
    key_arity: usize,
    permutation: Permutation,
) -> CollectionBundle<G, Row, T>
where
    G: Scope,
    G::Timestamp: Lattice + Refines<T>,
    T: Timestamp + Lattice,
{
    // Convenience wrapper to render the right kind of hierarchical plan.
    let build_hierarchical =
        |collection: Collection<G, (Row, Row)>, expr: HierarchicalPlan| match expr {
            HierarchicalPlan::Monotonic(expr) => build_monotonic(collection, expr),
            HierarchicalPlan::Bucketed(expr) => build_bucketed(collection, expr),
        };

    // Convenience wrapper to render the right kind of basic plan.
    let build_basic = |collection: Collection<G, (Row, Row)>, expr: BasicPlan| match expr {
        BasicPlan::Single(index, aggr) => build_basic_aggregate(collection, index, &aggr),
        BasicPlan::Multiple(aggrs) => build_basic_aggregates(collection, aggrs),
    };

    let arrangement_or_bundle: ArrangementOrCollection<G> = match plan {
        // If we have no aggregations or just a single type of reduction, we
        // can go ahead and render them directly.
        ReducePlan::Distinct => build_distinct(collection).into(),
        ReducePlan::DistinctNegated => build_distinct_retractions(collection).into(),
        ReducePlan::Accumulable(expr) => build_accumulable(collection, expr).into(),
        ReducePlan::Hierarchical(expr) => build_hierarchical(collection, expr).into(),
        ReducePlan::Basic(expr) => build_basic(collection, expr).into(),
        // Otherwise, we need to render something different for each type of
        // reduction, and then stitch them together.
        ReducePlan::Collation(expr) => {
            // First, we need to render our constituent aggregations.
            let mut to_collate = vec![];

            if let Some(accumulable) = expr.accumulable {
                to_collate.push((
                    ReductionType::Accumulable,
                    build_accumulable(collection.clone(), accumulable),
                ));
            }
            if let Some(hierarchical) = expr.hierarchical {
                to_collate.push((
                    ReductionType::Hierarchical,
                    build_hierarchical(collection.clone(), hierarchical),
                ));
            }
            if let Some(basic) = expr.basic {
                to_collate.push((ReductionType::Basic, build_basic(collection.clone(), basic)));
            }
            // Now we need to collate them together.
            build_collation(to_collate, expr.aggregate_types, &mut collection.scope()).into()
        }
    };
    arrangement_or_bundle.into_bundle(key_arity, permutation, err_input)
}
/// Render a dataflow based on the provided plan.
///
/// The output will be an arrangements that looks the same as if
/// we just had a single reduce operator computing everything together, and
/// this arrangement can also be re-used.
Render a dataflow based on the provided plan.
The output will be an arrangements that looks the same as if
we just had a single reduce operator computing everything together, and
this arrangement can also be re-used.
Render a dataflow based on the provided plan . The output will be an arrangements that looks the same as if we just had a single reduce operator computing everything together and this arrangement can also be re - used .
fn render_reduce_plan<G, T>(
    plan: ReducePlan,
    collection: Collection<G, (Row, Row)>,
    err_input: Collection<G, DataflowError>,
    key_arity: usize,
    permutation: Permutation,
) -> CollectionBundle<G, Row, T>
where
    G: Scope,
    G::Timestamp: Lattice + Refines<T>,
    T: Timestamp + Lattice,
{
    // Convenience wrapper to render the right kind of hierarchical plan.
    let build_hierarchical =
        |collection: Collection<G, (Row, Row)>, expr: HierarchicalPlan| match expr {
            HierarchicalPlan::Monotonic(expr) => build_monotonic(collection, expr),
            HierarchicalPlan::Bucketed(expr) => build_bucketed(collection, expr),
        };
    // Convenience wrapper to render the right kind of basic plan.
    let build_basic = |collection: Collection<G, (Row, Row)>, expr: BasicPlan| match expr {
        BasicPlan::Single(index, aggr) => build_basic_aggregate(collection, index, &aggr),
        BasicPlan::Multiple(aggrs) => build_basic_aggregates(collection, aggrs),
    };
    let arrangement_or_bundle: ArrangementOrCollection<G> = match plan {
        // If we have no aggregations or just a single type of reduction, we
        // can go ahead and render them directly.
        ReducePlan::Distinct => build_distinct(collection).into(),
        ReducePlan::DistinctNegated => build_distinct_retractions(collection).into(),
        ReducePlan::Accumulable(expr) => build_accumulable(collection, expr).into(),
        ReducePlan::Hierarchical(expr) => build_hierarchical(collection, expr).into(),
        ReducePlan::Basic(expr) => build_basic(collection, expr).into(),
        // Otherwise, we need to render something different for each type of
        // reduction, and then stitch them together.
        ReducePlan::Collation(expr) => {
            // First, we need to render our constituent aggregations.
            let mut to_collate = vec![];
            if let Some(accumulable) = expr.accumulable {
                to_collate.push((
                    ReductionType::Accumulable,
                    build_accumulable(collection.clone(), accumulable),
                ));
            }
            if let Some(hierarchical) = expr.hierarchical {
                to_collate.push((
                    ReductionType::Hierarchical,
                    build_hierarchical(collection.clone(), hierarchical),
                ));
            }
            if let Some(basic) = expr.basic {
                to_collate.push((ReductionType::Basic, build_basic(collection.clone(), basic)));
            }
            // Now we need to collate them together.
            build_collation(to_collate, expr.aggregate_types, &mut collection.scope()).into()
        }
    };
    arrangement_or_bundle.into_bundle(key_arity, permutation, err_input)
}
fn render_reduce_plan < G , T > ( plan : ReducePlan , collection : Collection < G , ( Row , Row ) > , err_input : Collection < G , DataflowError > , key_arity : usize , permutation : Permutation , ) -> CollectionBundle < G , Row , T > where G : Scope , G :: Timestamp : Lattice + Refines < T > , T : Timestamp + Lattice , { // Convenience wrapper to render the right kind of hierarchical plan. let build_hierarchical = | collection : Collection < G , ( Row , Row ) > , expr : HierarchicalPlan | match expr { HierarchicalPlan :: Monotonic ( expr ) => build_monotonic ( collection , expr ) , HierarchicalPlan :: Bucketed ( expr ) => build_bucketed ( collection , expr ) , } ; // Convenience wrapper to render the right kind of basic plan. let build_basic = | collection : Collection < G , ( Row , Row ) > , expr : BasicPlan | match expr { BasicPlan :: Single ( index , aggr ) => build_basic_aggregate ( collection , index , & aggr ) , BasicPlan :: Multiple ( aggrs ) => build_basic_aggregates ( collection , aggrs ) , } ; let arrangement_or_bundle : ArrangementOrCollection < G > = match plan { // If we have no aggregations or just a single type of reduction, we // can go ahead and render them directly. ReducePlan :: Distinct => build_distinct ( collection ) . into ( ) , ReducePlan :: DistinctNegated => build_distinct_retractions ( collection ) . into ( ) , ReducePlan :: Accumulable ( expr ) => build_accumulable ( collection , expr ) . into ( ) , ReducePlan :: Hierarchical ( expr ) => build_hierarchical ( collection , expr ) . into ( ) , ReducePlan :: Basic ( expr ) => build_basic ( collection , expr ) . into ( ) , // Otherwise, we need to render something different for each type of // reduction, and then stitch them together. ReducePlan :: Collation ( expr ) => { // First, we need to render our constituent aggregations. let mut to_collate = vec ! [ ] ; if let Some ( accumulable ) = expr . accumulable { to_collate . push ( ( ReductionType :: Accumulable , build_accumulable ( collection . clone ( ) , accumulable ) , ) ) ; } if let Some ( hierarchical ) = expr . hierarchical { to_collate . push ( ( ReductionType :: Hierarchical , build_hierarchical ( collection . clone ( ) , hierarchical ) , ) ) ; } if let Some ( basic ) = expr . basic { to_collate . push ( ( ReductionType :: Basic , build_basic ( collection . clone ( ) , basic ) ) ) ; } // Now we need to collate them together. build_collation ( to_collate , expr . aggregate_types , & mut collection . scope ( ) ) . into ( ) } } ; arrangement_or_bundle . into_bundle ( key_arity , permutation , err_input ) }
Render a dataflow based on the provided plan.
Render a dataflow based on the provided plan .
plan
ReducePlan
collection
Collection<G, (Row, Row)>
err_input
Collection<G, DataflowError>
key_arity
usize
permutation
Permutation
plan
ReducePlan
collection
Collection<G, (Row, Row)>
err_input
Collection<G, DataflowError>
key_arity
usize
permutation
Permutation