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// SERVER-2282 $or de duping with sparse indexes
t = db.jstests_org;
t.drop();
t.ensureIndex({a: 1}, {sparse: true});
t.ensureIndex({b: 1});
t.remove({});
t.save({a: 1, b: 2});
assert.eq(1, t.count({$or: [{a: 1}, {b: 2}]}));
t.remove({});
t.save({a: null, b: 2});
assert.eq(1, t.count({$or: [{a: null}, {b: 2}]}));
t.remove({});
t.save({b: 2});
assert.eq(1, t.count({$or: [{a: null}, {b: 2}]}));
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