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https://issues.apache.org/jira/browse/LUCENE-10039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17388737#comment-17388737
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ASF subversion and git services commented on LUCENE-10039:
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Commit e8663b30b85c1d48a8d18d37866a553895ffb8ae in lucene's branch
refs/heads/main from Julie Tibshirani
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=e8663b3 ]
LUCENE-10039: Fix single-field scoring for CombinedFieldQuery (#229)
When there's only one field, CombinedFieldQuery will ignore its weight while
scoring. This makes the scoring inconsistent, since the field weight is supposed
to multiply its term frequency.
This PR removes the optimizations around single-field scoring to make sure the
weight is always taken into account. These optimizations are not critical since
it should be uncommon to use CombinedFieldQuery with only one field.
> With a single field, CombinedFieldQuery can score incorrectly
> -------------------------------------------------------------
>
> Key: LUCENE-10039
> URL: https://issues.apache.org/jira/browse/LUCENE-10039
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Julie Tibshirani
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When there's only one field, {{CombinedFieldQuery}} will ignore its weight
> while scoring. This makes the scoring inconsistent, since the field weight is
> supposed to multiply its term frequency.
> This can also come up when searching over multiple fields, when some segment
> happens to contain only one field. The problem was caught by this test:
> {code}
> ant test -Dtestcase=TestCombinedFieldQuery
> -Dtests.method=testCopyFieldWithMissingFields -Dtests.seed=8FA982798BC8FEF6
> -Dtests.nightly=true
> {code}
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