@Override
    public void seek(long position) throws IOException {
      this.position = position;
    }
This is currently only used by Parquet; however, a generally applicable approach is used -
you pass in a set of offset pairs for a file, and the file is cached with these boundaries.
Don't add anything format specific here.
ql/src/java/org/apache/hadoop/hive/llap/LlapCacheAwareFs.java