// Test sorting with skipping and multiple candidate query plans.

t = db.jstests_sortc;
t.drop();

t.save({a: 1});
t.save({a: 2});

function checkA(a, sort, skip, query) {
    query = query || {};
    assert.eq(a, t.find(query).sort(sort).skip(skip)[0].a);
}

function checkSortAndSkip() {
    checkA(1, {a: 1}, 0);
    checkA(2, {a: 1}, 1);

    checkA(1, {a: 1}, 0, {a: {$gt: 0}, b: null});
    checkA(2, {a: 1}, 1, {a: {$gt: 0}, b: null});

    checkA(2, {a: -1}, 0);
    checkA(1, {a: -1}, 1);

    checkA(2, {a: -1}, 0, {a: {$gt: 0}, b: null});
    checkA(1, {a: -1}, 1, {a: {$gt: 0}, b: null});

    checkA(1, {$natural: 1}, 0);
    checkA(2, {$natural: 1}, 1);

    checkA(2, {$natural: -1}, 0);
    checkA(1, {$natural: -1}, 1);
}

checkSortAndSkip();

t.ensureIndex({a: 1});
checkSortAndSkip();