docs: void discard() {
          final int count = m_refCount.decrementAndGet();
          if (count == 0) {
              m_buffer.discard();
              m_buffer = null;
              if (m_schema != null) {
                  m_schema.discard();
                  m_schema = null;
              }
          } else if (count < 0) {
              VoltDB.crashLocalVoltDB("Broken refcounting in export", true, null);
          }
      }