palimpsest-dataflow 0.1.1

A Postgres WAL-backed live query sync engine.
Documentation 
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#![allow(clippy::all, clippy::nursery, clippy::pedantic)]

use palimpsest_dataflow::operators::{Count, Join};
use palimpsest_dataflow::AsCollection;
use timely::dataflow::operators::capture::Extract;
use timely::dataflow::operators::{Capture, Map, ToStream};

#[test]
fn join() {
    let data = timely::example(|scope| {
        let col1 = vec![
            ((0, 0), Default::default(), 1),
            ((1, 2), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();

        let col2 = vec![
            ((0, 'a'), Default::default(), 1),
            ((1, 'B'), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();

        // should produce triples `(0,0,'a')` and `(1,2,'B')`.
        col1.join(&col2).inner.capture()
    });

    let extracted = data.extract();
    assert_eq!(extracted.len(), 1);
    assert_eq!(
        extracted[0].1,
        vec![
            ((0, (0, 'a')), Default::default(), 1),
            ((1, (2, 'B')), Default::default(), 1)
        ]
    );
}

#[test]
fn join_map() {
    let data = timely::example(|scope| {
        let col1 = vec![
            ((0, 0), Default::default(), 1),
            ((1, 2), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();
        let col2 = vec![
            ((0, 'a'), Default::default(), 1),
            ((1, 'B'), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();

        // should produce records `(0 + 0,'a')` and `(1 + 2,'B')`.
        col1.join_map(&col2, |k, v1, v2| (*k + *v1, *v2))
            .inner
            .capture()
    });

    let extracted = data.extract();
    assert_eq!(extracted.len(), 1);
    assert_eq!(
        extracted[0].1,
        vec![
            ((0, 'a'), Default::default(), 1),
            ((3, 'B'), Default::default(), 1)
        ]
    );
}

#[test]
fn semijoin() {
    let data = timely::example(|scope| {
        let col1 = vec![
            ((0, 0), Default::default(), 1),
            ((1, 2), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();
        let col2 = vec![(0, Default::default(), 1)]
            .into_iter()
            .to_stream(scope)
            .as_collection();

        // should retain record `(0,0)` and discard `(1,2)`.
        col1.semijoin(&col2).inner.capture()
    });

    let extracted = data.extract();
    assert_eq!(extracted.len(), 1);
    assert_eq!(extracted[0].1, vec![((0, 0), Default::default(), 1)]);
}

#[test]
fn antijoin() {
    let data = timely::example(|scope| {
        let col1 = vec![
            ((0, 0), Default::default(), 1),
            ((1, 2), Default::default(), 1),
        ]
        .into_iter()
        .to_stream(scope)
        .as_collection();
        let col2 = vec![(0, Default::default(), 1)]
            .into_iter()
            .to_stream(scope)
            .as_collection();

        // should retain record `(1,2)` and discard `(0,0)`.
        col1.antijoin(&col2).consolidate().inner.capture()
    });
    let extracted = data.extract();
    assert_eq!(extracted.len(), 1);
    assert_eq!(extracted[0].1, vec![((1, 2), Default::default(), 1)]);
}

#[test]
fn join_scale_1() {
    join_scaling(1);
}
#[test]
fn join_scale_10() {
    join_scaling(10);
}
#[test]
fn join_scale_100() {
    join_scaling(100);
}
#[test]
fn join_scale_1000() {
    join_scaling(1000);
}
#[test]
fn join_scale_10000() {
    join_scaling(10000);
}
#[test]
fn join_scale_100000() {
    join_scaling(100000);
}
#[test]
fn join_scale_1000000() {
    join_scaling(1000000);
}

fn join_scaling(scale: u64) {
    let data = timely::example(move |scope| {
        let counts = (0..1)
            .to_stream(scope)
            .flat_map(move |_| (0..scale).map(|i| ((), i, 1)))
            .as_collection()
            .count();

        let odds = counts.filter(|x| x.1 % 2 == 1);
        let evens = counts.filter(|x| x.1 % 2 == 0);

        odds.join(&evens).inner.capture()
    });

    let extracted = data.extract();
    assert_eq!(extracted.len(), 0);
}