Function getUsedExtents

fdbserver/VersionedBTree.actor.cpp:2588–2590

	}

	Future<Standalone<VectorRef<LogicalPageID>>> getUsedExtents(QueueID queueID) override {
		return getUsedExtents_impl(this, queueID);
	}

	void pushExtentUsedList(QueueID queueID, LogicalPageID extID) override {
		extentUsedList.pushBack({ queueID, extID });