Function expr::join_permutations [−][src]
pub fn join_permutations(
key_arity: usize,
stream_permutation: HashMap<usize, usize>,
thinned_stream_arity: usize,
lookup_permutation: HashMap<usize, usize>
) -> HashMap<usize, usize>
Expand description
Given the permutations (see permutation_for_arrangement
and
(dataflow::plan::AvailableCollections
) corresponding to two
collections with the same key arity,
computes the permutation for the result of joining them.