Method is_pinned

be/src/runtime/buffered-tuple-stream.h:436–436

    inline int len() const { return handle.len(); }
    inline bool is_pinned() const { return handle.is_pinned(); }
    inline int pin_count() const { return handle.pin_count(); }
    Status GetBuffer(const BufferPool::BufferHandle** buffer) {
      RETURN_IF_ERROR(handle.GetBuffer(buffer));