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https://issues.apache.org/jira/browse/LUCENE-2635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-2635:
---------------------------------------
Attachment: LUCENE-2635.patch
Attached patch -- if sub scorer is null, and if the sub clause is required,
note the failure.
> BQ provides an explanation on a non-match
> -----------------------------------------
>
> Key: LUCENE-2635
> URL: https://issues.apache.org/jira/browse/LUCENE-2635
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-2635.patch
>
>
> Plug in seed -6336594106867842617L into TestExplanations then run
> TestSimpleExplanationsOfNonMatches and you'll hit this:
> {noformat}
> [junit] Testsuite:
> org.apache.lucene.search.TestSimpleExplanationsOfNonMatches
> [junit] Testcase:
> testBQ2(org.apache.lucene.search.TestSimpleExplanationsOfNonMatches): FAILED
> [junit] Explanation of [[+yy +w3]] for #0 doesn't indicate non-match:
> 0.08778467 = (MATCH) product of:
> [junit] 0.17556934 = (MATCH) sum of:
> [junit] 0.17556934 = (MATCH) weight(field:w3 in 0), product of:
> [junit] 0.5165708 = queryWeight(field:w3), product of:
> [junit] 0.7768564 = idf(docFreq=4, maxDocs=4)
> [junit] 0.6649502 = queryNorm
> [junit] 0.33987468 = (MATCH) fieldWeight(field:w3 in 0), product of:
> [junit] 1.0 = tf(termFreq(field:w3)=1)
> [junit] 0.7768564 = idf(docFreq=4, maxDocs=4)
> [junit] 0.4375 = fieldNorm(field=field, doc=0)
> [junit] 0.5 = coord(1/2)
> [junit] expected:<0.0> but was:<0.08778467>
> [junit] junit.framework.AssertionFailedError: Explanation of [[+yy +w3]]
> for #0 doesn't indicate non-match: 0.08778467 = (MATCH) product of:
> [junit] 0.17556934 = (MATCH) sum of:
> [junit] 0.17556934 = (MATCH) weight(field:w3 in 0), product of:
> [junit] 0.5165708 = queryWeight(field:w3), product of:
> [junit] 0.7768564 = idf(docFreq=4, maxDocs=4)
> [junit] 0.6649502 = queryNorm
> [junit] 0.33987468 = (MATCH) fieldWeight(field:w3 in 0), product of:
> [junit] 1.0 = tf(termFreq(field:w3)=1)
> [junit] 0.7768564 = idf(docFreq=4, maxDocs=4)
> [junit] 0.4375 = fieldNorm(field=field, doc=0)
> [junit] 0.5 = coord(1/2)
> [junit] expected:<0.0> but was:<0.08778467>
> [junit] at
> org.apache.lucene.search.CheckHits.checkNoMatchExplanations(CheckHits.java:60)
> [junit] at
> org.apache.lucene.search.TestSimpleExplanationsOfNonMatches.qtest(TestSimpleExplanationsOfNonMatches.java:36)
> [junit] at
> org.apache.lucene.search.TestExplanations.qtest(TestExplanations.java:101)
> [junit] at
> org.apache.lucene.search.TestSimpleExplanations.testBQ2(TestSimpleExplanations.java:235)
> [junit] at
> org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:397)
> [junit] at
> org.apache.lucene.util.LuceneTestCase.run(LuceneTestCase.java:389)
> {noformat}
> The bug is real -- BQ's explain method fails to properly enforce required
> clauses when the sub-scorer is null. Thank you random testing!
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