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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