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https://issues.apache.org/jira/browse/LUCENE-8029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226917#comment-16226917
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Robert Muir commented on LUCENE-8029:
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My concern on this one is the expensive recomputation cost in e.g. MultiTerms,
i don't like that its hidden.
What callers are there other than per-segment stuff just looking to use it for
sizing purposes? Its not passed to the scoring API or anything, so i don't
think its much like e.g. totalTermFreq etc all.
> Fields.size() should not return -1
> ----------------------------------
>
> Key: LUCENE-8029
> URL: https://issues.apache.org/jira/browse/LUCENE-8029
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> All call sites of Fields.size() recompute it if it is not available. We
> should make the API easier to use and require that it never returns -1.
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