if (spannedIndexDataPositions == null)
{
spannedIndexDataPositions = new HashMap<KeyPosition, PositionSize>();
}
// read the next index entry to see how big the row is corresponding to the current, mmap-segment-spanning one
input.readUTF();
long nextDataPosition = input.readLong();
input.seek(nextIndexPosition);
spannedIndexDataPositions.put(info, new PositionSize(dataPosition, nextDataPosition - dataPosition));
}
}