fn implement_arrangements<'a>(
    inputs: &mut [MirRelationExpr],
    available_arrangements: &[Vec<Vec<MirScalarExpr>>],
    needed_arrangements: impl Iterator<Item = &'a (usize, Vec<MirScalarExpr>)>,
) -> MapFilterProject {
    // Collect needed arrangements by source index.
    let mut needed = vec![Vec::new(); inputs.len()];
    for (index, key) in needed_arrangements {
        needed[*index].push(key.clone());
    }

    let mut lifted_mfps = vec![None; inputs.len()];

    // Transform inputs[index] based on needed and available arrangements.
    // Specifically, lift intervening mfps if all arrangements exist.
    for (index, needed) in needed.iter_mut().enumerate() {
        needed.sort();
        needed.dedup();
        // We should lift any mfps, iff all arrangements are otherwise available.
        if !needed.is_empty()
            && needed
                .iter()
                .all(|key| available_arrangements[index].contains(key))
        {
            lifted_mfps[index] = Some(MapFilterProject::extract_non_errors_from_expr_mut(
                &mut inputs[index],
            ));
        }
        // Clean up existing arrangements, and install one with the needed keys.
        while let MirRelationExpr::ArrangeBy { input: inner, .. } = &mut inputs[index] {
            inputs[index] = inner.take_dangerous();
        }
        if !needed.is_empty() {
            // If a mfp was lifted in order to install the arrangement, permute
            // the arrangement.
            if let Some(lifted_mfp) = &lifted_mfps[index] {
                let (_, _, project) = lifted_mfp.as_map_filter_project();
                for arr in needed.iter_mut() {
                    for key in arr.iter_mut() {
                        key.permute(&project);
                    }
                }
            }
            inputs[index] = MirRelationExpr::arrange_by(inputs[index].take_dangerous(), needed);
        }
    }

    // Combined lifted mfps into one.
    let new_join_mapper = JoinInputMapper::new(inputs);
    let mut arity = new_join_mapper.total_columns();
    let combined_mfp = MapFilterProject::new(arity);
    let mut combined_filter = Vec::new();
    let mut combined_map = Vec::new();
    let mut combined_project = Vec::new();
    for (index, lifted_mfp) in lifted_mfps.into_iter().enumerate() {
        if let Some(mut lifted_mfp) = lifted_mfp {
            lifted_mfp.permute(
                // globalize all input column references
                new_join_mapper
                    .local_columns(index)
                    .zip(new_join_mapper.global_columns(index))
                    .collect(),
                // shift the position of scalars to be after the last input
                // column
                arity,
            );
            let (mut map, mut filter, mut project) = lifted_mfp.as_map_filter_project();
            arity += map.len();
            combined_map.append(&mut map);
            combined_filter.append(&mut filter);
            combined_project.append(&mut project);
        } else {
            combined_project.extend(new_join_mapper.global_columns(index));
        }
    }
    combined_mfp
        .map(combined_map)
        .filter(combined_filter)
        .project(combined_project)
}
/// Modify `inputs` to ensure specified arrangements are available.
///
/// Lift filter predicates when all needed arrangements are otherwise available.
Modify `inputs` to ensure specified arrangements are available.
Lift filter predicates when all needed arrangements are otherwise available.
Modify ` inputs ` to ensure specified arrangements are available . Lift filter predicates when all needed arrangements are otherwise available .
fn implement_arrangements<'a>(
    inputs: &mut [MirRelationExpr],
    available_arrangements: &[Vec<Vec<MirScalarExpr>>],
    needed_arrangements: impl Iterator<Item = &'a (usize, Vec<MirScalarExpr>)>,
) -> MapFilterProject {
    // Collect needed arrangements by source index.
    let mut needed = vec![Vec::new(); inputs.len()];
    for (index, key) in needed_arrangements {
        needed[*index].push(key.clone());
    }
    let mut lifted_mfps = vec![None; inputs.len()];
    // Transform inputs[index] based on needed and available arrangements.
    // Specifically, lift intervening mfps if all arrangements exist.
    for (index, needed) in needed.iter_mut().enumerate() {
        needed.sort();
        needed.dedup();
        // We should lift any mfps, iff all arrangements are otherwise available.
        if !needed.is_empty()
            && needed
                .iter()
                .all(|key| available_arrangements[index].contains(key))
        {
            lifted_mfps[index] = Some(MapFilterProject::extract_non_errors_from_expr_mut(
                &mut inputs[index],
            ));
        }
        // Clean up existing arrangements, and install one with the needed keys.
        while let MirRelationExpr::ArrangeBy { input: inner, .. } = &mut inputs[index] {
            inputs[index] = inner.take_dangerous();
        }
        if !needed.is_empty() {
            // If a mfp was lifted in order to install the arrangement, permute
            // the arrangement.
            if let Some(lifted_mfp) = &lifted_mfps[index] {
                let (_, _, project) = lifted_mfp.as_map_filter_project();
                for arr in needed.iter_mut() {
                    for key in arr.iter_mut() {
                        key.permute(&project);
                    }
                }
            }
            inputs[index] = MirRelationExpr::arrange_by(inputs[index].take_dangerous(), needed);
        }
    }
    // Combined lifted mfps into one.
    let new_join_mapper = JoinInputMapper::new(inputs);
    let mut arity = new_join_mapper.total_columns();
    let combined_mfp = MapFilterProject::new(arity);
    let mut combined_filter = Vec::new();
    let mut combined_map = Vec::new();
    let mut combined_project = Vec::new();
    for (index, lifted_mfp) in lifted_mfps.into_iter().enumerate() {
        if let Some(mut lifted_mfp) = lifted_mfp {
            lifted_mfp.permute(
                // globalize all input column references
                new_join_mapper
                    .local_columns(index)
                    .zip(new_join_mapper.global_columns(index))
                    .collect(),
                // shift the position of scalars to be after the last input
                // column
                arity,
            );
            let (mut map, mut filter, mut project) = lifted_mfp.as_map_filter_project();
            arity += map.len();
            combined_map.append(&mut map);
            combined_filter.append(&mut filter);
            combined_project.append(&mut project);
        } else {
            combined_project.extend(new_join_mapper.global_columns(index));
        }
    }
    combined_mfp
        .map(combined_map)
        .filter(combined_filter)
        .project(combined_project)
}
fn implement_arrangements < ' a > ( inputs : & mut [ MirRelationExpr ] , available_arrangements : & [ Vec < Vec < MirScalarExpr > > ] , needed_arrangements : impl Iterator < Item = & ' a ( usize , Vec < MirScalarExpr > ) > , ) -> MapFilterProject { // Collect needed arrangements by source index. let mut needed = vec ! [ Vec new ( ) inputs len ( ) ] ; for ( index , key ) in needed_arrangements { needed [ * index ] . push ( key . clone ( ) ) ; } let mut lifted_mfps = vec ! [ None inputs len ( ) ] ; // Transform inputs[index] based on needed and available arrangements. // Specifically, lift intervening mfps if all arrangements exist. for ( index , needed ) in needed . iter_mut ( ) . enumerate ( ) { needed . sort ( ) ; needed . dedup ( ) ; // We should lift any mfps, iff all arrangements are otherwise available. if ! needed . is_empty ( ) && needed . iter ( ) . all ( | key | available_arrangements [ index ] . contains ( key ) ) { lifted_mfps [ index ] = Some ( MapFilterProject :: extract_non_errors_from_expr_mut ( & mut inputs [ index ] , ) ) ; } // Clean up existing arrangements, and install one with the needed keys. while let MirRelationExpr :: ArrangeBy { input : inner , .. } = & mut inputs [ index ] { inputs [ index ] = inner . take_dangerous ( ) ; } if ! needed . is_empty ( ) { // If a mfp was lifted in order to install the arrangement, permute // the arrangement. if let Some ( lifted_mfp ) = & lifted_mfps [ index ] { let ( _ , _ , project ) = lifted_mfp . as_map_filter_project ( ) ; for arr in needed . iter_mut ( ) { for key in arr . iter_mut ( ) { key . permute ( & project ) ; } } } inputs [ index ] = MirRelationExpr :: arrange_by ( inputs [ index ] . take_dangerous ( ) , needed ) ; } } // Combined lifted mfps into one. let new_join_mapper = JoinInputMapper :: new ( inputs ) ; let mut arity = new_join_mapper . total_columns ( ) ; let combined_mfp = MapFilterProject :: new ( arity ) ; let mut combined_filter = Vec :: new ( ) ; let mut combined_map = Vec :: new ( ) ; let mut combined_project = Vec :: new ( ) ; for ( index , lifted_mfp ) in lifted_mfps . into_iter ( ) . enumerate ( ) { if let Some ( mut lifted_mfp ) = lifted_mfp { lifted_mfp . permute ( // globalize all input column references new_join_mapper . local_columns ( index ) . zip ( new_join_mapper . global_columns ( index ) ) . collect ( ) , // shift the position of scalars to be after the last input // column arity , ) ; let ( mut map , mut filter , mut project ) = lifted_mfp . as_map_filter_project ( ) ; arity += map . len ( ) ; combined_map . append ( & mut map ) ; combined_filter . append ( & mut filter ) ; combined_project . append ( & mut project ) ; } else { combined_project . extend ( new_join_mapper . global_columns ( index ) ) ; } } combined_mfp . map ( combined_map ) . filter ( combined_filter ) . project ( combined_project ) }
Modify `inputs` to ensure specified arrangements are available.
Modify ` inputs ` to ensure specified arrangements are available .
inputs
&mut [MirRelationExpr]
available_arrangements
&[Vec<Vec<MirScalarExpr>>]
needed_arrangements
impl Iterator<Item = &'a (usize, Vec<MirScalarExpr>)>
inputs
&mut [MirRelationExpr]
available_arrangements
&[Vec<Vec<MirScalarExpr>>]
needed_arrangements
impl Iterator<Item = &'a (usize, Vec<MirScalarExpr>)>