Function makeEmptyRoot

fdbserver/VersionedBTree.actor.cpp:5103–5115

	}

	ACTOR static Future<Reference<ArenaPage>> makeEmptyRoot(VersionedBTree* self) {
		state Reference<ArenaPage> page = self->m_pager->newPageBuffer();
		page->init(self->m_encodingType, PageType::BTreeNode, 1);
		if (page->isEncrypted()) {
			EncryptionKey k = wait(self->m_keyProvider->getByRange(dbBegin.key, dbEnd.key));
			page->encryptionKey = k;
		}

		BTreePage* btpage = (BTreePage*)page->mutateData();
		btpage->init(1, 0);
		btpage->tree()->build(page->dataSize() - sizeof(BTreePage), nullptr, nullptr, nullptr, nullptr);
		return page;
	}

	void toTraceEvent(TraceEvent& e) const {
		m_pager->toTraceEvent(e);