vsop-479 commented on code in PR #12846:
URL: https://github.com/apache/lucene/pull/12846#discussion_r1445677720
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lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99SkipWriter.java:
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@@ -202,7 +202,11 @@ protected void writeSkipData(int level, DataOutput
skipBuffer) throws IOExceptio
CompetitiveImpactAccumulator competitiveFreqNorms =
curCompetitiveFreqNorms[level];
assert competitiveFreqNorms.getCompetitiveFreqNormPairs().size() > 0;
if (level + 1 < numberOfSkipLevels) {
- curCompetitiveFreqNorms[level + 1].addAll(competitiveFreqNorms);
+ if (curCompetitiveFreqNorms[level + 1].isEmpty()) {
+ curCompetitiveFreqNorms[level + 1].copy(competitiveFreqNorms);
+ } else {
+ curCompetitiveFreqNorms[level + 1].addAll(competitiveFreqNorms);
+ }
Review Comment:
Yes, This optimization only affects non-zero level acc.
I measured the called count with TestTermScore.testRandomTopDocs (numDocs =
TEST_NIGHTLY):
Method | count
-- | --
copy zero level (bufferSkip) | 1270
copy non zero (writeSkipData) | 214
addAll (writeSkipData) | 1196
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