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// SERVER-393 Test indexed matching with $exists.
t = db.jstests_exists6;
t.drop();
t.ensureIndex({b: 1});
t.save({});
t.save({b: 1});
t.save({b: null});
assert.eq(2, t.find({b: {$exists: true}}).itcount());
assert.eq(2, t.find({b: {$not: {$exists: false}}}).itcount());
assert.eq(1, t.find({b: {$exists: false}}).itcount());
assert.eq(1, t.find({b: {$not: {$exists: true}}}).itcount());
// Now check existence of second compound field.
t.ensureIndex({a: 1, b: 1});
t.save({a: 1});
t.save({a: 1, b: 1});
t.save({a: 1, b: null});
assert.eq(2, t.find({a: 1, b: {$exists: true}}).itcount());
assert.eq(2, t.find({a: 1, b: {$not: {$exists: false}}}).itcount());
assert.eq(1, t.find({a: 1, b: {$exists: false}}).itcount());
assert.eq(1, t.find({a: 1, b: {$not: {$exists: true}}}).itcount());
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