Function differential_dataflow::collection::concatenate [−][src]
pub fn concatenate<G, D, R, I>(
scope: &mut G,
iterator: I
) -> Collection<G, D, R> where
G: Scope,
D: Data,
R: Semigroup,
I: IntoIterator<Item = Collection<G, D, R>>,
Concatenates multiple collections.
This method has the effect of a sequence of calls to concat
, but it does
so in one operator rather than a chain of many operators.
Examples
extern crate timely; extern crate differential_dataflow; use differential_dataflow::input::Input; fn main() { ::timely::example(|scope| { let data = scope.new_collection_from(1 .. 10).1; let odds = data.filter(|x| x % 2 == 1); let evens = data.filter(|x| x % 2 == 0); differential_dataflow::collection::concatenate(scope, vec![odds, evens]) .assert_eq(&data); }); }