void run() { // Create a new collection. Database* db = _ctx.db(); Collection* coll; { WriteUnitOfWork wunit(&_opCtx); ASSERT_OK(db->dropCollection(&_opCtx, _nss)); coll = db->createCollection(&_opCtx, _nss); OpDebug* const nullOpDebug = nullptr; ASSERT_OK(coll->insertDocument(&_opCtx, InsertStatement(BSON("_id" << 1 << "a" << "dup")), nullOpDebug, true)); ASSERT_OK(coll->insertDocument(&_opCtx, InsertStatement(BSON("_id" << 2 << "a" << "dup")), nullOpDebug, true)); wunit.commit(); } MultiIndexBlock indexer; const BSONObj spec = BSON("name" << "a" << "ns" << coll->ns().ns() << "key" << BSON("a" << 1) << "v" << static_cast<int>(kIndexVersion) << "unique" << true << "background" << background); ON_BLOCK_EXIT([&] { indexer.cleanUpAfterBuild(&_opCtx, coll); }); ASSERT_OK(indexer.init(&_opCtx, coll, spec, MultiIndexBlock::kNoopOnInitFn).getStatus()); auto desc = coll->getIndexCatalog()->findIndexByName(&_opCtx, "a", true /* includeUnfinished */); ASSERT(desc); // Hybrid index builds check duplicates explicitly. ASSERT_OK(indexer.insertAllDocumentsInCollection(&_opCtx, coll)); auto status = indexer.checkConstraints(&_opCtx); ASSERT_EQUALS(status.code(), ErrorCodes::DuplicateKey); }