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Skip heavy TreeSet opts for the first group in SearchGroup#merge #15896

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Skip heavy TreeSet opts for the first group in SearchGroup#merge #15896

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1566328
Skip heavy TreeSet opts for the first group in SearchGroup#merge
gaobinlong Mar 30, 2026
5f51974
Modify change log
gaobinlong Mar 31, 2026
6c27281
merge main
gaobinlong Apr 8, 2026
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2 changes: 2 additions & 0 deletions lucene/CHANGES.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,8 @@ Optimizations

* GITHUB#15779: Improve BytesRefHash.add performance by optimize rehash operation (tyronecai)

* GITHUB#15896: Skip heavy TreeSet opts for the first group in SearchGroup#merge (Binlong Gao)

* GITHUB#15886: Cache frozen FieldType to skip redundant schema validation. (Tim Brooks)

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10 changes: 7 additions & 3 deletions lucene/grouping/src/java/org/apache/lucene/search/grouping/SearchGroup.java
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Expand Up @@ -248,13 +248,17 @@ private void updateNextGroup(int topN, ShardIter<T> shard) {
// System.out.println(" competes=" + competes);

if (competes) {
// Group's sort changed -- remove & re-insert
if (mergedGroup.inQueue) {
// Group's sort changed -- remove & re-insert, update first group in place for
// efficiency
boolean skipHeavyOps = queue.first() == mergedGroup;
if (mergedGroup.inQueue && !skipHeavyOps) {
queue.remove(mergedGroup);
}
mergedGroup.topValues = group.sortValues;
mergedGroup.minShardIndex = shard.shardIndex;
queue.add(mergedGroup);
if (!skipHeavyOps) {
queue.add(mergedGroup);
}
mergedGroup.inQueue = true;
}
}
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