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// Test $exists with array element field names SERVER-2897
t = db.jstests_exists8;
t.drop();
t.save({a: [1]});
assert.eq(1, t.count({'a.0': {$exists: true}}));
assert.eq(1, t.count({'a.1': {$exists: false}}));
assert.eq(0, t.count({'a.0': {$exists: false}}));
assert.eq(0, t.count({'a.1': {$exists: true}}));
t.remove({});
t.save({a: [1, 2]});
assert.eq(1, t.count({'a.0': {$exists: true}}));
assert.eq(0, t.count({'a.1': {$exists: false}}));
assert.eq(0, t.count({'a.0': {$exists: false}}));
assert.eq(1, t.count({'a.1': {$exists: true}}));
t.remove({});
t.save({a: [{}]});
assert.eq(1, t.count({'a.0': {$exists: true}}));
assert.eq(1, t.count({'a.1': {$exists: false}}));
assert.eq(0, t.count({'a.0': {$exists: false}}));
assert.eq(0, t.count({'a.1': {$exists: true}}));
t.remove({});
t.save({a: [{}, {}]});
assert.eq(1, t.count({'a.0': {$exists: true}}));
assert.eq(0, t.count({'a.1': {$exists: false}}));
assert.eq(0, t.count({'a.0': {$exists: false}}));
assert.eq(1, t.count({'a.1': {$exists: true}}));
t.remove({});
t.save({a: [{'b': 2}, {'a': 1}]});
assert.eq(1, t.count({'a.a': {$exists: true}}));
assert.eq(1, t.count({'a.1.a': {$exists: true}}));
assert.eq(1, t.count({'a.0.a': {$exists: false}}));
t.remove({});
t.save({a: [[1]]});
assert.eq(1, t.count({'a.0': {$exists: true}}));
assert.eq(1, t.count({'a.0.0': {$exists: true}}));
assert.eq(0, t.count({'a.0.0': {$exists: false}}));
assert.eq(0, t.count({'a.0.0.0': {$exists: true}}));
assert.eq(1, t.count({'a.0.0.0': {$exists: false}}));
t.remove({});
t.save({a: [[[1]]]});
assert.eq(1, t.count({'a.0.0.0': {$exists: true}}));
t.remove({});
t.save({a: [[{b: 1}]]});
assert.eq(0, t.count({'a.b': {$exists: true}}));
assert.eq(1, t.count({'a.b': {$exists: false}}));
assert.eq(1, t.count({'a.0.b': {$exists: true}}));
assert.eq(0, t.count({'a.0.b': {$exists: false}}));
t.remove({});
t.save({a: [[], [{b: 1}]]});
assert.eq(0, t.count({'a.0.b': {$exists: true}}));
assert.eq(1, t.count({'a.0.b': {$exists: false}}));
t.remove({});
t.save({a: [[], [{b: 1}]]});
assert.eq(1, t.count({'a.1.b': {$exists: true}}));
assert.eq(0, t.count({'a.1.b': {$exists: false}}));
t.remove({});
t.save({a: [[], [{b: 1}]]});
assert.eq(1, t.count({'a.1.0.b': {$exists: true}}));
assert.eq(0, t.count({'a.1.0.b': {$exists: false}}));
t.remove({});
t.save({a: [[], [{b: 1}]]});
assert.eq(0, t.count({'a.1.1.b': {$exists: true}}));
assert.eq(1, t.count({'a.1.1.b': {$exists: false}}));
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