// Test sorting with skipping and multiple candidate query plans.
(function() {
"use strict";

const coll = db.jstests_sortc;
coll.drop();

assert.commandWorked(coll.insert({a: 1}));
assert.commandWorked(coll.insert({a: 2}));

function checkA(a, sort, skip, query) {
    query = query || {};
    assert.eq(a, coll.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});
}

checkSortAndSkip();

assert.commandWorked(coll.createIndex({a: 1}));
checkSortAndSkip();
}());