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https://issues.apache.org/jira/browse/LUCENE-9107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006815#comment-17006815
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Tommaso Teofili commented on LUCENE-9107:
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thanks Adrien for looking into this, I've tried with a pure disjunction
(BooleanQuery) and the numbers are about the same as with {{CommonTermsQuery}}.
{{ClassicSimilarity}} slowness contribution is non trivial: top-k scoring with
{{ClassicSimilarity}} ranges 2 to 2.5 seconds, whereas it ranges 1.5 to 2
seconds with {{BM25Similarity}}.
> CommonsTermsQuery with huge no. of terms slower with top-k scoring
> ------------------------------------------------------------------
>
> Key: LUCENE-9107
> URL: https://issues.apache.org/jira/browse/LUCENE-9107
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 8.3
> Reporter: Tommaso Teofili
> Priority: Major
>
> In [1] a {{CommonTermsQuery}} is used in order to perform a query with lots
> of (duplicate) terms. Using a max term frequency cutoff of 0.999 for low
> frequency terms, the query, although big, finishes in around 2-300ms with
> Lucene 7.6.0.
> However, when upgrading the code to Lucene 8.x, the query runs in 2-3s
> instead [2].
> After digging a bit into it it seems that the regression in speed comes from
> the fact that top-k scoring introduced by default in version 8 is causing
> that, not sure "where" exactly in the code though.
> When switching back to complete hit scoring [3], the speed goes back to the
> initial 2-300ms also in Lucene 8.3.x.
> It'd be nice to understand the reason why this is happening and if it is only
> concerning {{CommonTermsQuery}} or affecting {{BooleanQuery}} as well.
> If this is a case that depends on the data and application involved (Anserini
> in this case), the application should handle it, otherwise if it is a
> regression/bug in Lucene it'd be nice to fix it.
> [1] :
> https://github.com/tteofili/Anserini-embeddings/blob/nnsearch/src/main/java/io/anserini/embeddings/nn/fw/FakeWordsRunner.java
> [2] :
> https://github.com/castorini/anserini/blob/master/src/main/java/io/anserini/analysis/vectors/ApproximateNearestNeighborEval.java
> [3] :
> https://github.com/tteofili/anserini/blob/ann-paper-reproduce/src/main/java/io/anserini/analysis/vectors/ApproximateNearestNeighborEval.java#L174
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