Method clear

src/QLContext.actor.cpp:273–281

	}

	void clear(Reference<DocTransaction> tr, DataKey key) override {
		DataKey documentPrefix = key.keyPrefix(collectionPath.size() + 1);
		auto docDeferred = shouldDoUpdate(tr, documentPrefix);
		if (docDeferred->dirty.insert(this).second) {
			docDeferred->index_update_actors.push_back(doIndexUpdate(tr, docDeferred, documentPrefix));
		}

		next->clear(tr, key);
	}

	void clearDescendants(Reference<DocTransaction> tr, DataKey key) override {
		DataKey documentPrefix = key.keyPrefix(collectionPath.size() + 1);