jpountz commented on code in PR #12997:
URL: https://github.com/apache/lucene/pull/12997#discussion_r1444533812
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lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99PostingsReader.java:
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@@ -399,7 +400,9 @@ public PostingsEnum reset(IntBlockTermState termState, int
flags) throws IOExcep
doc = -1;
this.needsFreq = PostingsEnum.featureRequested(flags,
PostingsEnum.FREQS);
this.isFreqsRead = true;
- if (indexHasFreq == false || needsFreq == false) {
+ // if reuse, we don't consider whether the needsFreq is changed. this is
undefined in freq().
+ // see also: BasePostingsFormatTestCase#testPostingsEnumFreqs
+ if ((indexHasFreq == false || needsFreq == false) && reuse == false) {
Review Comment:
Do we actually need to check `reuse` here? My understanding is that there
are 3 cases:
1. Freqs exist and they are needed. In that case, refillDocs() will make
sure to fill this array, so we don't need to do anything here.
2. Freqs are not needed. There is nothing to do as calling
`PostingsEnum#freq()` is undefined.
3. Freqs are needed but they don't exist. In that case we need to
initialize this array with ones here.
So it looks to me that we don't need to check the value of `reuse` and could
change this condition to `if (indexHasFreq == false && needsFreqs)`? If you're
saying this may be a bottleneck, we may also want to replace the for loop with
a call to `Arrays#fill`.
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