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https://issues.apache.org/jira/browse/LUCENE-4297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13431125#comment-13431125
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Robert Muir commented on LUCENE-4297:
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Simple patch: remove the coord multiplication in ConjunctionScorer completely.
the counting one is then correct, and the non-counting "dual" one is fine too,
because its used in more complex situations (e.g. minShouldMatch) where its
subscorers are counting scorers.
tests pass.
> BooleanScorer2 sometimes multiplies coord() twice into the score
> ----------------------------------------------------------------
>
> Key: LUCENE-4297
> URL: https://issues.apache.org/jira/browse/LUCENE-4297
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-4297.patch, LUCENE-4297_test.patch
>
>
> this is a problem if you have a custom coord impl
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