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t = db.index_elemmatch1;
t.drop();
x = 0;
y = 0;
var bulk = t.initializeUnorderedBulkOp();
for (a = 0; a < 100; a++) {
for (b = 0; b < 100; b++) {
bulk.insert({a: a, b: b % 10, arr: [{x: x++ % 10, y: y++ % 10}]});
}
}
assert.writeOK(bulk.execute());
t.ensureIndex({a: 1, b: 1});
t.ensureIndex({"arr.x": 1, a: 1});
assert.eq(100, t.find({a: 55}).itcount(), "A1");
assert.eq(10, t.find({a: 55, b: 7}).itcount(), "A2");
q = {
a: 55,
b: {$in: [1, 5, 8]}
};
assert.eq(30, t.find(q).itcount(), "A3");
q.arr = {
$elemMatch: {x: 5, y: 5}
};
assert.eq(10, t.find(q).itcount(), "A4");
function nscannedForCursor(explain, cursor) {
plans = explain.allPlans;
for (i in plans) {
if (plans[i].cursor == cursor) {
return plans[i].nscanned;
}
}
return -1;
}
var explain = t.find(q).hint({"arr.x": 1, a: 1}).explain("executionStats");
assert.eq(t.find(q).itcount(), explain.executionStats.totalKeysExamined);
printjson(t.find(q).explain());
print("Num results:");
assert.eq(10, t.find(q).itcount());
printjson(t.find(q).itcount());
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