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/**
* Tests passing hint to the count command:
* - A hint should be respected even if it results in an incorrect count.
* - A bad argument to the hint() method should raise an error.
* - The hint() method should support both the name of the index, and the object spec of the
* index.
*
* @tags: [requires_fastcount]
*/
(function() {
"use strict";
var coll = db.jstests_count_hint;
coll.drop();
assert.commandWorked(coll.insert({i: 1}));
assert.commandWorked(coll.insert({i: 2}));
assert.eq(2, coll.find().count());
assert.commandWorked(coll.ensureIndex({i: 1}));
assert.eq(2, coll.find().hint("i_1").count());
assert.eq(2, coll.find().hint({i: 1}).count());
assert.eq(1, coll.find({i: 1}).hint("_id_").count());
assert.eq(1, coll.find({i: 1}).hint({_id: 1}).count());
assert.eq(2, coll.find().hint("_id_").count());
assert.eq(2, coll.find().hint({_id: 1}).count());
// Create a sparse index which should have no entries.
assert.commandWorked(coll.ensureIndex({x: 1}, {sparse: true}));
// A hint should be respected, even if it results in the wrong answer.
assert.eq(0, coll.find().hint("x_1").count());
assert.eq(0, coll.find().hint({x: 1}).count());
assert.eq(0, coll.find({i: 1}).hint("x_1").count());
assert.eq(0, coll.find({i: 1}).hint({x: 1}).count());
// SERVER-14792: bad hints should cause the count to fail, even if there is no query predicate.
assert.throws(function() {
coll.find().hint({bad: 1, hint: 1}).count();
});
assert.throws(function() {
coll.find({i: 1}).hint({bad: 1, hint: 1}).count();
});
assert.throws(function() {
coll.find().hint("BAD HINT").count();
});
assert.throws(function() {
coll.find({i: 1}).hint("BAD HINT").count();
});
// Test that a bad hint fails with the correct error code.
let cmdRes = db.runCommand({count: coll.getName(), hint: {bad: 1, hint: 1}});
assert.commandFailedWithCode(cmdRes, ErrorCodes.BadValue, tojson(cmdRes));
var regex = new RegExp("hint provided does not correspond to an existing index");
assert(regex.test(cmdRes.errmsg));
})();
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