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// Check null key generation.
t = db.jstests_indexv;
t.drop();
t.ensureIndex({'a.b': 1});
t.save({a: [{}, {b: 1}]});
var e = t.find({'a.b': null}).explain("executionStats");
assert.eq(1, e.executionStats.nReturned);
assert.eq(1, e.executionStats.totalKeysExamined);
t.drop();
t.ensureIndex({'a.b.c': 1});
t.save({a: [{b: []}, {b: {c: 1}}]});
var e = t.find({'a.b.c': null}).explain("executionStats");
assert.eq(0, e.executionStats.nReturned);
assert.eq(1, e.executionStats.totalKeysExamined);
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