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// Cannot implicitly shard accessed collections because of extra shard key index in sharded
// collection.
// @tags: [assumes_no_implicit_index_creation, requires_non_retryable_writes, requires_fastcount]
t = db.index_sparse1;
t.drop();
t.insert({_id: 1, x: 1});
t.insert({_id: 2, x: 2});
t.insert({_id: 3, x: 2});
t.insert({_id: 4});
t.insert({_id: 5});
assert.eq(5, t.count(), "A1");
assert.eq(5, t.find().sort({x: 1}).itcount(), "A2");
t.createIndex({x: 1});
assert.eq(2, t.getIndexes().length, "B1");
assert.eq(5, t.find().sort({x: 1}).itcount(), "B2");
t.dropIndex({x: 1});
assert.eq(1, t.getIndexes().length, "B3");
t.createIndex({x: 1}, {sparse: 1});
assert.eq(2, t.getIndexes().length, "C1");
assert.eq(5, t.find().sort({x: 1}).itcount(), "C2");
t.dropIndex({x: 1});
assert.eq(1, t.getIndexes().length, "C3");
// -- sparse & unique
t.remove({_id: 2});
// test that we can't create a unique index without sparse
assert.commandFailed(t.createIndex({x: 1}, {unique: 1}));
assert.eq(1, t.getIndexes().length, "D2");
t.createIndex({x: 1}, {unique: 1, sparse: 1});
assert.eq(2, t.getIndexes().length, "E1");
t.dropIndex({x: 1});
assert.eq(1, t.getIndexes().length, "E3");
t.insert({_id: 2, x: 2});
t.createIndex({x: 1}, {unique: 1, sparse: 1});
assert.eq(1, t.getIndexes().length, "F1");
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