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https://issues.apache.org/jira/browse/LUCENE-9635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-9635.
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Fix Version/s: 8.8
Resolution: Fixed
> BM25FQuery - MultiNormsLeafSimScorer needs to mask long value for long
> documents
> --------------------------------------------------------------------------------
>
> Key: LUCENE-9635
> URL: https://issues.apache.org/jira/browse/LUCENE-9635
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/sandbox
> Affects Versions: 8.6
> Reporter: Yilun Cui
> Priority: Minor
> Labels: pull-request-available
> Fix For: 8.8
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Through some experimentation with the BM25FQuery on long documents, I've
> discovered that there is a bug that doesn't mask the encoded norm's long
> value during scoring. For long documents (or long fields) this may cause
> ArrayIndexOutOfBoundsExceptions.
> The line where I suspect the bug is being exposed is here
> https://github.com/apache/lucene-solr/blob/master/lucene/sandbox/src/java/org/apache/lucene/sandbox/search/MultiNormsLeafSimScorer.java#L131
> Here is a similar use in BM25Similarity with the masking
> https://github.com/apache/lucene-solr/blob/c413656b627160d49eb9e9f1f84ec4945db80f0e/lucene/core/src/java/org/apache/lucene/search/similarities/BM25Similarity.java#L233
> My experimentation shows that to expose this bug, there must be a match for a
> token in more than one field (which is what BM25FQuery is for). In addition
> one of the fields must be >= 32792 tokens long.
> I've provided tests in the pull request to demonstrate this.
> Created a PR here: https://github.com/apache/lucene-solr/pull/2138
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