### Question:
MultiplePinotSegmentRecordReader implements RecordReader { public MultiplePinotSegmentRecordReader(List<File> indexDirs) throws Exception { this(indexDirs, null, null); } MultiplePinotSegmentRecordReader(List<File> indexDirs);  MultiplePinotSegmentRecordReader(List<File> indexDirs, @Nullable Schema schema,
      @Nullable List<String> sortOrder); Schema getSchema(); @Override void init(File dataFile, Set<String> fieldsToRead, @Nullable RecordReaderConfig recordReaderConfig); @Override boolean hasNext(); @Override GenericRow next(); @Override GenericRow next(GenericRow reuse); @Override void rewind(); @Override void close();  }### Answer:
@Test public void testMultiplePinotSegmentRecordReader() throws Exception { List<GenericRow> outputRows = new ArrayList<>(); try (MultiplePinotSegmentRecordReader pinotSegmentRecordReader = new MultiplePinotSegmentRecordReader( _segmentIndexDirList)) { while (pinotSegmentRecordReader.hasNext()) { outputRows.add(pinotSegmentRecordReader.next()); } } Assert.assertEquals(outputRows.size(), NUM_SEGMENTS * NUM_ROWS, "Number of rows returned by PinotSegmentRecordReader is incorrect"); int outputRowIndex = 0; for (List<GenericRow> rows : _rowsList) { for (GenericRow row : rows) { GenericRow outputRow = outputRows.get(outputRowIndex++); Assert.assertEquals(outputRow.getValue(D_SV_1), row.getValue(D_SV_1)); Assert.assertEquals(outputRow.getValue(D_SV_2), row.getValue(D_SV_2)); Assert.assertTrue(PinotSegmentUtil.compareMultiValueColumn(outputRow.getValue(D_MV_1), row.getValue(D_MV_1))); Assert.assertEquals(outputRow.getValue(M1), row.getValue(M1)); Assert.assertEquals(outputRow.getValue(M2), row.getValue(M2)); Assert.assertEquals(outputRow.getValue(TIME_1), row.getValue(TIME_1)); Assert.assertEquals(outputRow.getValue(TIME_2), row.getValue(TIME_2)); } } }