Function permute_order

src/transform/src/join_implementation.rs:994–1005

Permute the keys in `order` to compensate for projections being lifted from inputs. `lifted_projections` has an optional projection for each input.

(
    order: &mut Vec<(usize, Vec<MirScalarExpr>, Option<JoinInputCharacteristics>)>,
    lifted_projections: &Vec<Option<Vec<usize>>>,
)

/// Permute the keys in `order` to compensate for projections being lifted from inputs.
/// `lifted_projections` has an optional projection for each input.
fn permute_order(
    order: &mut Vec<(usize, Vec<MirScalarExpr>, Option<JoinInputCharacteristics>)>,
    lifted_projections: &Vec<Option<Vec<usize>>>,
) {
    order.iter_mut().for_each(|(index, key, _)| {
        key.iter_mut().for_each(|kc| {
            if let Some(proj) = &lifted_projections[*index] {
                kc.permute(proj);
            }
        })
    })
}

// Computes the best join orders for each input.
//