gf2121 commented on code in PR #12610:
URL: https://github.com/apache/lucene/pull/12610#discussion_r1346202698


##########
lucene/core/src/java/org/apache/lucene/util/bkd/MutablePointTreeReaderUtils.java:
##########
@@ -81,6 +86,40 @@ protected int byteAt(int i, int k) {
           return (reader.getDocID(i) >>> Math.max(0, shift)) & 0xff;
         }
       }
+
+      @Override
+      protected Sorter getFallbackSorter(int k) {
+        return new InPlaceMergeSorter() {
+          @Override
+          protected int compare(int i, int j) {
+            if (k < config.packedBytesLength) {
+              reader.getValue(i, scratch1);
+              reader.getValue(j, scratch2);
+              int v =
+                  Arrays.compareUnsigned(
+                      scratch1.bytes,
+                      scratch1.offset + k,
+                      scratch1.offset + scratch1.length,
+                      scratch2.bytes,
+                      scratch2.offset + k,
+                      scratch2.offset + scratch2.length);
+              if (v != 0) {
+                return v;
+              }
+            }
+            if (bitsPerDocId == 0) {

Review Comment:
   Yes, see this 
[line](https://github.com/apache/lucene/blob/eb14a1a0a69757dcbda4829c4a160ecd1a5530ad/lucene/core/src/java/org/apache/lucene/util/bkd/MutablePointTreeReaderUtils.java#L59).
 We are avoiding doc id comparing with a stable sort if index sorting in not 
enabled :)



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