message: Issue Buffer Manager Queue
  Restore PurgeQueue to AddToEvictionQueue.
diff: @@ -350,7 +350,7 @@ BufferHandle BufferManager::Pin(shared_ptr<BlockHandle> &handle) {
  void BufferManager::AddToEvictionQueue(shared_ptr<BlockHandle> &handle) {
  D_ASSERT(handle->readers == 0);
  handle->eviction_timestamp++;
  - // PurgeQueue();
  + PurgeQueue();
  queue->q.enqueue(BufferEvictionNode(weak_ptr<BlockHandle>(handle), handle->eviction_timestamp));
  }
  