static Supplier<FileSystem> getFsSupplier(final Path path,
      final Configuration conf) {
    return () -> {
      try {
        return path.getFileSystem(conf);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
    };
  }
stripeRgs[stripeIx'] => boolean array (could be a bitmask) of rg-s that need to be read.
Contains only stripes that are read, and only columns included. null => read all RGs.
llap-server/src/java/org/apache/hadoop/hive/llap/io/encoded/OrcEncodedDataReader.java