Program: 112894
Project: 112894
Buggy source:
@Override public CloseableIterator<Index<?,?>> getIndices(final Map<ByteArrayId,DataStatistics<SimpleFeature>> stats,final BasicQuery query,final PrimaryIndex[] indices){
  return new CloseableIterator<Index<?,?>>(){
    PrimaryIndex nextIdx=null;
    boolean done=false;
    int i=0;
    @Override public boolean hasNext(){
      double bestIndexBitsUsed=-1;
      int bestIndexDimensionCount=-1;
      PrimaryIndex bestIdx=null;
      while (!done && (i < indices.length)) {
        nextIdx=indices[i++];
        if (nextIdx.getIndexStrategy().getOrderedDimensionDefinitions().length == 0) {
          continue;
        }
        final List<MultiDimensionalNumericData> queryRanges=query.getIndexConstraints(nextIdx);
        if (IndexUtils.isFullTableScan(queryRanges)) {
          if (bestIdx == null) {
            bestIdx=nextIdx;
          }
        }
 else {
          double currentBitsUsed=0;
          final int currentDimensionCount=nextIdx.getIndexStrategy().getOrderedDimensionDefinitions().length;
          if (currentDimensionCount >= bestIndexDimensionCount) {
            for (            final MultiDimensionalNumericData qr : queryRanges) {
              final double[] dataRangePerDimension=new double[qr.getDimensionCount()];
              for (int d=0; d < dataRangePerDimension.length; d++) {
                dataRangePerDimension[d]=qr.getMaxValuesPerDimension()[d] - qr.getMinValuesPerDimension()[d];
              }
              currentBitsUsed+=IndexUtils.getDimensionalBitsUsed(nextIdx.getIndexStrategy(),dataRangePerDimension);
            }
            if ((currentDimensionCount > bestIndexDimensionCount) || (currentBitsUsed > bestIndexBitsUsed)) {
              bestIndexBitsUsed=currentBitsUsed;
              bestIndexDimensionCount=currentDimensionCount;
              bestIdx=nextIdx;
            }
          }
        }
      }
      nextIdx=bestIdx;
      done=true;
      return nextIdx != null;
    }
    @Override public Index<?,?> next() throws NoSuchElementException {
      if (nextIdx == null) {
        throw new NoSuchElementException();
      }
      final Index<?,?> returnVal=nextIdx;
      nextIdx=null;
      return returnVal;
    }
    @Override public void remove(){
    }
    @Override public void close() throws IOException {
    }
  }
;
}

Fixed version (ground truth):
@Override public CloseableIterator<Index<?,?>> getIndices(final Map<ByteArrayId,DataStatistics<SimpleFeature>> stats,final BasicQuery query,final PrimaryIndex[] indices){
  return new CloseableIterator<Index<?,?>>(){
    PrimaryIndex nextIdx=null;
    boolean done=false;
    int i=0;
    @Override public boolean hasNext(){
      double bestIndexBitsUsed=-1;
      int bestIndexDimensionCount=-1;
      PrimaryIndex bestIdx=null;
      while (!done && (i < indices.length)) {
        nextIdx=indices[i++];
        if (nextIdx.getIndexStrategy().getOrderedDimensionDefinitions().length == 0) {
          continue;
        }
        final List<MultiDimensionalNumericData> queryRanges=query.getIndexConstraints(nextIdx);
        final int currentDimensionCount=nextIdx.getIndexStrategy().getOrderedDimensionDefinitions().length;
        if (IndexUtils.isFullTableScan(queryRanges) || !queryRangeDimensionsMatch(currentDimensionCount,queryRanges)) {
          if (bestIdx == null) {
            bestIdx=nextIdx;
          }
        }
 else {
          double currentBitsUsed=0;
          if (currentDimensionCount >= bestIndexDimensionCount) {
            for (            final MultiDimensionalNumericData qr : queryRanges) {
              final double[] dataRangePerDimension=new double[qr.getDimensionCount()];
              for (int d=0; d < dataRangePerDimension.length; d++) {
                dataRangePerDimension[d]=qr.getMaxValuesPerDimension()[d] - qr.getMinValuesPerDimension()[d];
              }
              currentBitsUsed+=IndexUtils.getDimensionalBitsUsed(nextIdx.getIndexStrategy(),dataRangePerDimension);
            }
            if ((currentDimensionCount > bestIndexDimensionCount) || (currentBitsUsed > bestIndexBitsUsed)) {
              bestIndexBitsUsed=currentBitsUsed;
              bestIndexDimensionCount=currentDimensionCount;
              bestIdx=nextIdx;
            }
          }
        }
      }
      nextIdx=bestIdx;
      done=true;
      return nextIdx != null;
    }
    @Override public Index<?,?> next() throws NoSuchElementException {
      if (nextIdx == null) {
        throw new NoSuchElementException();
      }
      final Index<?,?> returnVal=nextIdx;
      nextIdx=null;
      return returnVal;
    }
    @Override public void remove(){
    }
    @Override public void close() throws IOException {
    }
  }
;
}