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t = db.null1;
t.drop();
t.save({x: 1});
t.save({x: null});
assert.eq(1, t.find({x: null}).count(), "A");
assert.eq(1, t.find({x: {$ne: null}}).count(), "B");
t.ensureIndex({x: 1});
assert.eq(1, t.find({x: null}).count(), "C");
assert.eq(1, t.find({x: {$ne: null}}).count(), "D");
// -----
assert.eq(2, t.find({y: null}).count(), "E");
t.ensureIndex({y: 1});
assert.eq(2, t.find({y: null}).count(), "E");
t.dropIndex({y: 1});
t.ensureIndex({y: 1}, {sparse: true});
assert.eq(2, t.find({y: null}).count(), "E");
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