mongo/jstests/core/query/array/array_match3.js

// SERVER-2902 Test indexing of numerically referenced array elements.

let t = db.jstests_array_match3;
t.drop();

// Test matching numericallly referenced array element.
t.save({a: {"0": 5}});
t.save({a: [5]});
assert.eq(2, t.count({"a.0": 5}));

// Test with index.
t.createIndex({"a.0": 1});
assert.eq(2, t.count({"a.0": 5}));