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// Some correctness checks for fast and normal count modes, including with skip and limit.
t = db.jstests_count6;
function checkCountForObject(obj) {
t.drop();
t.ensureIndex({b: 1, a: 1});
function checkCounts(query, expected) {
assert.eq(expected, t.count(query), "A1");
assert.eq(expected, t.find(query).skip(0).limit(0).count(true), "A2");
// Check proper counts with various skip and limit specs.
for (var skip = 1; skip <= 2; ++skip) {
for (var limit = 1; limit <= 2; ++limit) {
assert.eq(Math.max(expected - skip, 0), t.find(query).skip(skip).count(true), "B1");
assert.eq(Math.min(expected, limit), t.find(query).limit(limit).count(true), "B2");
assert.eq(Math.min(Math.max(expected - skip, 0), limit),
t.find(query).skip(skip).limit(limit).count(true),
"B4");
// Check limit(x) = limit(-x)
assert.eq(t.find(query).limit(limit).count(true),
t.find(query).limit(-limit).count(true),
"C1");
assert.eq(t.find(query).skip(skip).limit(limit).count(true),
t.find(query).skip(skip).limit(-limit).count(true),
"C2");
}
}
// Check limit(0) has no effect
assert.eq(expected, t.find(query).limit(0).count(true), "D1");
assert.eq(
Math.max(expected - skip, 0), t.find(query).skip(skip).limit(0).count(true), "D2");
assert.eq(
expected, t.getDB().runCommand({count: t.getName(), query: query, limit: 0}).n, "D3");
assert.eq(Math.max(expected - skip, 0),
t.getDB().runCommand({count: t.getName(), query: query, limit: 0, skip: skip}).n,
"D4");
}
for (var i = 0; i < 5; ++i) {
checkCounts({a: obj.a, b: obj.b}, i);
checkCounts({b: obj.b, a: obj.a}, i);
t.insert(obj);
}
t.insert({a: true, b: true});
t.insert({a: true, b: 1});
t.insert({a: false, b: 1});
t.insert({a: false, b: true});
t.insert({a: false, b: false});
checkCounts({a: obj.a, b: obj.b}, i);
checkCounts({b: obj.b, a: obj.a}, i);
// Check with no query
checkCounts({}, 10);
}
// Check fast count mode.
checkCountForObject({a: true, b: false});
// Check normal count mode.
checkCountForObject({a: 1, b: 0});
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