michaelschiff removed a comment on issue #265: PairwiseSetOperations.aNotB 
throws ArrayOutOfBoundsException
URL: 
https://github.com/apache/incubator-datasketches-java/issues/265#issuecomment-520121606
 
 
   The problem is this line of PairwiseSetOperations
   
   ```
       return HeapCompactOrderedSketch
           .compact(Arrays.copyOf(outCache, outCount), emptyRule, seedHash, 
outCount, thetaLong);
   ```
   
   In the case of the intersection above `outCache` is the size of the min of 
the two inner caches (non-zero) and filled with 0's (since the two sets dont 
overlap).  `outCount` is 0.  `Arrays.copyOf(outCache, outCount)` then will 
produce a 0 len array.  The `empty` param is set based on whether _either of 
the input sketches was empty_ instead of whether the result of the intersection 
is empty.

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