docs: private int getTupleDataRowCount(List<DBBPool.BBContainer> outputBuffers) {
          if (outputBuffers == null || outputBuffers.size() != m_tableTasks.size()) return 0;
          int accumulator = 0;
          for (int i = 0; i < outputBuffers.size(); ++i) {
              SnapshotDataTarget target = m_tableTasks.get(i).m_target;
              int rowCount = target.getInContainerRowCount(outputBuffers.get(i));
              if (rowCount != SnapshotDataTarget.ROW_COUNT_UNSUPPORTED) {
                  accumulator += target.getInContainerRowCount(outputBuffers.get(i));
              }
          }
          return accumulator;
      }