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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, requires_fastcount]
// Test explain for {upsert: true} updates.
var t = db.jstests_explain_upsert;
t.drop();
var explain;
// Explained upsert against an empty collection should succeed and be a no-op.
explain = db.runCommand(
{explain: {update: t.getName(), updates: [{q: {a: 1}, u: {a: 1}, upsert: true}]}});
assert.commandWorked(explain);
// Collection should still not exist.
assert.eq(0, t.count());
assert(!t.drop());
// Add a document to the collection.
t.insert({a: 3});
// An explained upsert against a non-empty collection should also succeed as a no-op.
explain = db.runCommand(
{explain: {update: t.getName(), updates: [{q: {a: 1}, u: {a: 1}, upsert: true}]}});
assert.commandWorked(explain);
assert.eq(1, t.count());
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