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https://issues.apache.org/jira/browse/LUCENE-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901904#action_12901904
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Yonik Seeley commented on LUCENE-2617:
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bq. Are we sure that non-existent terms/phrases should contribute to coord?
Yep :-)
Adding an unrelated document and having scores radically change on other docs
isn't a good thing.
It also makes testing and relevancy tuning hard (hoss & I were really
scratching our heads last night trying to figure out why coord wasn't being
applied). idf is currently the only similarity factor that varies with index
size + content... adding coord to that list wouldn't be good.
Actually, I just thought of something potentially *much* worse. With
per-segment searching, doesn't this make coord vary per-segment? That means
we're adding up scores that aren't comparable... and all of a sudden this is
looking like a much worse bug. A match in a very small segment is likely to
contribute much more to a score than a match in a large segment.
> coord should still apply to missing terms/clauses
> -------------------------------------------------
>
> Key: LUCENE-2617
> URL: https://issues.apache.org/jira/browse/LUCENE-2617
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Attachments: LUCENE-2617.patch
>
>
> Missing terms in a boolean query "disappear" (i.e. they don't even affect the
> coord factor).
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