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// Cannot implicitly shard accessed collections because of following errmsg: A single
// update/delete on a sharded collection must contain an exact match on _id or contain the shard
// key.
// @tags: [assumes_unsharded_collection]
var res;
t = db.unset2;
t.drop();
t.save({a: ["a", "b", "c", "d"]});
t.update({}, {$unset: {"a.3": 1}});
assert.eq(["a", "b", "c", null], t.findOne().a);
t.update({}, {$unset: {"a.1": 1}});
assert.eq(["a", null, "c", null], t.findOne().a);
t.update({}, {$unset: {"a.0": 1}});
assert.eq([null, null, "c", null], t.findOne().a);
t.update({}, {$unset: {"a.4": 1}});
assert.eq([null, null, "c", null], t.findOne().a); // no change
t.drop();
t.save({a: ["a", "b", "c", "d", "e"]});
t.update({}, {$unset: {"a.2": 1}, $set: {"a.3": 3, "a.4": 4, "a.5": 5}});
assert.eq(["a", "b", null, 3, 4, 5], t.findOne().a);
t.drop();
t.save({a: ["a", "b", "c", "d", "e"]});
res = t.update({}, {$unset: {"a.2": 1}, $set: {"a.2": 4}});
assert.writeError(res);
assert.eq(["a", "b", "c", "d", "e"], t.findOne().a);
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