@Override
    public String toString() {
      return String.format(
          "RowPositionInBatch: batchIndex: %d, rowIndexInBatch: %d, blockIndex: %d, block: %s",
          batchIndex, rowIndexInBatch, block == null ? 0 : block.blockIndex, block);
    }
RowPositionInBatch encapsulates some positioning data for a given row index.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/ptf/VectorPTFGroupBatches.java