danmuzi commented on code in PR #11784:
URL: https://github.com/apache/lucene/pull/11784#discussion_r978324992
##########
lucene/core/src/java/org/apache/lucene/util/hnsw/NeighborArray.java:
##########
@@ -46,27 +45,23 @@ public NeighborArray(int maxSize, boolean descOrder) {
* nodes.
*/
public void add(int newNode, float newScore) {
- if (size == node.length) {
- node = ArrayUtil.grow(node);
- score = ArrayUtil.growExact(score, node.length);
- }
- if (size > 0) {
- float previousScore = score[size - 1];
- assert ((scoresDescOrder && (previousScore >= newScore))
- || (scoresDescOrder == false && (previousScore <= newScore)))
- : "Nodes are added in the incorrect order!";
- }
+ assert isSorted(newScore) : "Nodes are added in the incorrect order!";
node[size] = newNode;
score[size] = newScore;
++size;
}
+ private boolean isSorted(float newScore) {
+ if (size > 0) {
+ float previousScore = score[size - 1];
+ return ((scoresDescOrder && (previousScore >= newScore))
+ || (scoresDescOrder == false && (previousScore <= newScore)));
Review Comment:
It seems to be an [XNOR](https://en.wikipedia.org/wiki/XNOR_gate) operation.
(A & B) | (!A & !B) => A == B
So it can be changed to a simple form as follows:
```java
return (previousScore == newScore) || (scoresDescOrder == (previousScore >
newScore))
```
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