iverase commented on pull request #371:
URL: https://github.com/apache/lucene/pull/371#issuecomment-939995941


   >> can't MutablePointValues behave like a single-leaf PointValues instance?
   
   The is some friction there. 
   
   First, in theory we should have the min/max point value for that leaf which 
currently don't always have (we are throwing a  UnsupportedOperationException() 
). 
   
   Another issue is that strictly we are not complying with the PointValues 
contract that says that for 1D case, we should emit values in a specific order 
which is not true for MutablePointValues.
   
   Finally what happen if the number of points in bigger than 
Integer.MAX_VALUE? MaxPointPerLeafNode is an integer so we will have trouble 
representing such structure.
   
   I have tried that approach, trying to make MutablePointValues look like a 
one leaf tree and my feeling is that it makes things much harder, but indeed 
this patch proposes to add a new abstraction but I was hoping it would reflect 
better that data structures we are using.


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