private static void duelFieldDataDouble(
      Random random,
      AtomicReaderContext context,
      IndexNumericFieldData left,
      IndexNumericFieldData right)
      throws Exception {
    AtomicNumericFieldData leftData =
        random.nextBoolean() ? left.load(context) : left.loadDirect(context);
    AtomicNumericFieldData rightData =
        random.nextBoolean() ? right.load(context) : right.loadDirect(context);

    int numDocs = context.reader().maxDoc();
    SortedNumericDoubleValues leftDoubleValues = leftData.getDoubleValues();
    SortedNumericDoubleValues rightDoubleValues = rightData.getDoubleValues();
    for (int i = 0; i < numDocs; i++) {
      leftDoubleValues.setDocument(i);
      rightDoubleValues.setDocument(i);
      int numValues = leftDoubleValues.count();
      assertThat(numValues, equalTo(rightDoubleValues.count()));
      double previous = 0;
      for (int j = 0; j < numValues; j++) {
        double current = rightDoubleValues.valueAt(j);
        if (Double.isNaN(current)) {
          assertTrue(Double.isNaN(leftDoubleValues.valueAt(j)));
        } else {
          assertThat(leftDoubleValues.valueAt(j), closeTo(current, 0.0001));
        }
        if (j > 0) {
          assertThat(Double.compare(previous, current), lessThan(0));
        }
        previous = current;
      }
    }
  }
  private static void duelFieldDataLong(
      Random random,
      AtomicReaderContext context,
      IndexNumericFieldData left,
      IndexNumericFieldData right)
      throws Exception {
    AtomicNumericFieldData leftData =
        random.nextBoolean() ? left.load(context) : left.loadDirect(context);
    AtomicNumericFieldData rightData =
        random.nextBoolean() ? right.load(context) : right.loadDirect(context);

    int numDocs = context.reader().maxDoc();
    SortedNumericDocValues leftLongValues = leftData.getLongValues();
    SortedNumericDocValues rightLongValues = rightData.getLongValues();
    for (int i = 0; i < numDocs; i++) {
      leftLongValues.setDocument(i);
      rightLongValues.setDocument(i);
      int numValues = leftLongValues.count();
      long previous = 0;
      assertThat(numValues, equalTo(rightLongValues.count()));
      for (int j = 0; j < numValues; j++) {
        long current;
        assertThat(leftLongValues.valueAt(j), equalTo(current = rightLongValues.valueAt(j)));
        if (j > 0) {
          assertThat(previous, lessThan(current));
        }
        previous = current;
      }
    }
  }
  private static void duelFieldDataGeoPoint(
      Random random,
      AtomicReaderContext context,
      IndexGeoPointFieldData left,
      IndexGeoPointFieldData right,
      Distance precision)
      throws Exception {
    AtomicGeoPointFieldData leftData =
        random.nextBoolean() ? left.load(context) : left.loadDirect(context);
    AtomicGeoPointFieldData rightData =
        random.nextBoolean() ? right.load(context) : right.loadDirect(context);

    int numDocs = context.reader().maxDoc();
    MultiGeoPointValues leftValues = leftData.getGeoPointValues();
    MultiGeoPointValues rightValues = rightData.getGeoPointValues();
    for (int i = 0; i < numDocs; ++i) {
      leftValues.setDocument(i);
      final int numValues = leftValues.count();
      rightValues.setDocument(i);
      ;
      assertEquals(numValues, rightValues.count());
      List<GeoPoint> leftPoints = Lists.newArrayList();
      List<GeoPoint> rightPoints = Lists.newArrayList();
      for (int j = 0; j < numValues; ++j) {
        GeoPoint l = leftValues.valueAt(j);
        leftPoints.add(new GeoPoint(l.getLat(), l.getLon()));
        GeoPoint r = rightValues.valueAt(j);
        rightPoints.add(new GeoPoint(r.getLat(), r.getLon()));
      }
      for (GeoPoint l : leftPoints) {
        assertTrue(
            "Couldn't find " + l + " among " + rightPoints, contains(l, rightPoints, precision));
      }
      for (GeoPoint r : rightPoints) {
        assertTrue(
            "Couldn't find " + r + " among " + leftPoints, contains(r, leftPoints, precision));
      }
    }
  }
  private static void duelFieldDataBytes(
      Random random,
      AtomicReaderContext context,
      IndexFieldData<?> left,
      IndexFieldData<?> right,
      Preprocessor pre)
      throws Exception {
    AtomicFieldData leftData = random.nextBoolean() ? left.load(context) : left.loadDirect(context);
    AtomicFieldData rightData =
        random.nextBoolean() ? right.load(context) : right.loadDirect(context);

    int numDocs = context.reader().maxDoc();
    SortedBinaryDocValues leftBytesValues = leftData.getBytesValues();
    SortedBinaryDocValues rightBytesValues = rightData.getBytesValues();
    BytesRef leftSpare = new BytesRef();
    BytesRef rightSpare = new BytesRef();

    for (int i = 0; i < numDocs; i++) {
      leftBytesValues.setDocument(i);
      rightBytesValues.setDocument(i);
      int numValues = leftBytesValues.count();
      assertThat(numValues, equalTo(rightBytesValues.count()));
      BytesRef previous = null;
      for (int j = 0; j < numValues; j++) {
        rightSpare.copyBytes(rightBytesValues.valueAt(j));
        leftSpare.copyBytes(leftBytesValues.valueAt(j));
        if (previous != null) {
          assertThat(pre.compare(previous, rightSpare), lessThan(0));
        }
        previous = BytesRef.deepCopyOf(rightSpare);
        pre.toString(rightSpare);
        pre.toString(leftSpare);
        assertThat(pre.toString(leftSpare), equalTo(pre.toString(rightSpare)));
      }
    }
  }