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https://issues.apache.org/jira/browse/LUCENE-3401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090727#comment-13090727
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Robert Muir commented on LUCENE-3401:
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Also for the record i think its garbage that some stats such as docFreq just
silently return 0 here, but for things like sumTotalTermFreq is a hassle...
Its already annoying we have to deal with the -1 preflex case here too... maybe
we should add helper methods to IndexSearcher so at least you only have one
case?!
> need to ensure that sims that use collection-level stats (e.g.
> sumTotalTermFreq) handle non-existent field
> ----------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3401
> URL: https://issues.apache.org/jira/browse/LUCENE-3401
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: flexscoring branch
> Reporter: Robert Muir
> Attachments: LUCENE-3401.patch
>
>
> Because of things like queryNorm, unfortunately similarities have to handle
> the case where they are asked to computeStats() for a term, where the field
> does not exist at all.
> (Note they will never have to actually score anything, but unless we break
> how queryNorm works for TFIDF, we have to deal with this case).
> I noticed this while doing some benchmarking, so i created a test to test
> some cases like this across all the sims.
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