@Override
  public BatchToRowReader<?, ?> getWrapper(
      org.apache.hadoop.mapred.RecordReader<NullWritable, VectorizedRowBatch> vrr,
      VectorizedRowBatchCtx vrbCtx, List<Integer> includedCols) {
    return new OrcOiBatchToRowReader(vrr, vrbCtx, includedCols);
  }
Recursively builds 2 maps:
 ID to type description
 child to parent type description ID
@param typeDescription - the considered type description, root on first invocation
@param idMap
@param parentIdMap
ql/src/java/org/apache/hadoop/hive/ql/io/orc/OrcInputFormat.java