public long getPos() throws IOException {
    if (recordReader != null) {
      return recordReader.getPos();
    } else {
      return 0;
    }
  }
BucketizedHiveRecordReader is a wrapper on a list of RecordReader. It behaves
similar as HiveRecordReader while it wraps a list of RecordReader from one
file.
ql/src/java/org/apache/hadoop/hive/ql/io/BucketizedHiveRecordReader.java