// Cannot implicitly shard accessed collections because queries on a sharded collection are not
// able to be covered when they aren't on the shard key since the document needs to be fetched in
// order to apply the SHARDING_FILTER stage.
// @tags: [assumes_unsharded_collection]

// Compound index covered query tests with sort

// Include helpers for analyzing explain output.
load("jstests/libs/analyze_plan.js");

var coll = db.getCollection("covered_sort_3");
coll.drop();
for (i = 0; i < 100; i++) {
    coll.insert({a: i, b: "strvar_" + (i % 13), c: NumberInt(i % 10)});
}

coll.ensureIndex({a: 1, b: -1, c: 1});

// Test no query, sort on all fields in index order
var plan = coll.find({}, {b: 1, c: 1, _id: 0})
               .sort({a: 1, b: -1, c: 1})
               .hint({a: 1, b: -1, c: 1})
               .explain("executionStats");
assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
       "sort.3.1 - indexOnly should be true on covered query");
assert.eq(0,
          plan.executionStats.totalDocsExamined,
          "sort.3.1 - docs examined should be 0 for covered query");

print('all tests pass');