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/**
* Tests find with $elemMatch when supporting indexes are in place.
* @tags: [assumes_balancer_off]
*/
(function() {
"use strict";
const coll = db.index_elemmatch1;
coll.drop();
let x = 0;
let y = 0;
const bulk = coll.initializeUnorderedBulkOp();
for (let a = 0; a < 10; a++) {
for (let b = 0; b < 10; b++) {
bulk.insert({a: a, b: b % 10, arr: [{x: x++ % 10, y: y++ % 10}]});
}
}
assert.commandWorked(bulk.execute());
assert.commandWorked(coll.createIndex({a: 1, b: 1}));
assert.commandWorked(coll.createIndex({"arr.x": 1, a: 1}));
const query = {
a: 5,
b: {$in: [1, 3, 5]},
arr: {$elemMatch: {x: 5, y: 5}}
};
const count = coll.find(query).itcount();
assert.eq(count, 1);
const explain = coll.find(query).hint({"arr.x": 1, a: 1}).explain("executionStats");
assert.commandWorked(explain);
assert.eq(count, explain.executionStats.totalKeysExamined, explain);
})();
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