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https://issues.apache.org/jira/browse/LUCENE-2936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999157#comment-12999157
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Hoss Man commented on LUCENE-2936:
----------------------------------
bq. Hoss's assumption is correct because the problem was found at customer site
when they used a BooleanQuery containing PhraseQueries (term query on 1-gram
fields)
sure .. but to be clear: the crux of the issue was really a bug in PhraseQuery
-- it wasn't correctly identifying where there was a match/non-match
(independently of when the score was zero/non-zero).
the reason my initial attempt at exposing the bug (by setting an index boost of
0 on some of the fields) didn't cause any of the existing
TestSimpleExplanations.testP* to fail was because of the bugs i mentioned in in
CheckHits (it was naively looking at hte score to verify when an explanation
was for a match/non-match) so the bug didn't show up in the testP* methods
until i fixed that. It did show up in the "testMultiFieldBQofPQ*" methods i
added because BooleanQuery's explain logic was actually modifying the score of
it's explanation based on the match value of the explanation for the
sub-queries (because of coord)
> score and explain don't match
> -----------------------------
>
> Key: LUCENE-2936
> URL: https://issues.apache.org/jira/browse/LUCENE-2936
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.9.4, 3.0.3, 3.1, 4.0
> Reporter: Koji Sekiguchi
> Assignee: Hoss Man
> Priority: Minor
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2936.patch, LUCENE-2936.patch, LUCENE-2936.patch,
> LUCENE-2936.test.patch, TestScore.java
>
>
> I've faced this problem recently. I'll attach a program to reproduce the
> problem soon. The program outputs the following:
> {noformat}
> ** score = 0.10003257
> ** explain
> 0.050016284 = (MATCH) product of:
> 0.15004885 = (MATCH) sum of:
> 0.15004885 = weight(f1:"note book" in 0), product of:
> 0.3911943 = queryWeight(f1:"note book"), product of:
> 0.61370564 = idf(f1: note=1 book=1)
> 0.6374299 = queryNorm
> 0.38356602 = fieldWeight(f1:"note book" in 0), product of:
> 1.0 = tf(phraseFreq=1.0)
> 0.61370564 = idf(f1: note=1 book=1)
> 0.625 = fieldNorm(field=f1, doc=0)
> 0.33333334 = coord(1/3)
> {noformat}
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