@SuppressWarnings("unchecked") // See https://github.com/Parquet/parquet-mr/issues/106 private void openNextReader() { if (Formats.PARQUET.equals(descriptor.getFormat())) { this.reader = new ParquetFileSystemDatasetReader(fileSystem, filesIter.next(), accessor.getReadSchema(), accessor.getType()); } else if (Formats.JSON.equals(descriptor.getFormat())) { this.reader = new JSONFileReader<E>( fileSystem, filesIter.next(), accessor); } else if (Formats.CSV.equals(descriptor.getFormat())) { this.reader = new CSVFileReader<E>(fileSystem, filesIter.next(), descriptor, accessor); } else if (Formats.INPUTFORMAT.equals(descriptor.getFormat())) { this.reader = new InputFormatReader(fileSystem, filesIter.next(), descriptor); } else { this.reader = new FileSystemDatasetReader<E>(fileSystem, filesIter.next(), accessor.getReadSchema(), accessor.getType()); } reader.initialize(); this.readerIterator = Iterators.filter(reader, constraints.toEntityPredicate( (pathIter != null ? pathIter.getStorageKey() : null), accessor)); }