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https://issues.apache.org/jira/browse/LUCENE-4300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-4300:
--------------------------------
Attachment: LUCENE-4300.patch
updated patch: I beefed up the random tests and also added 2 standalone tests
(one for minNrShouldMatch == 1, the other for prohibited clauses).
> BooleanQuery inconsistently applies coord() if it rewrites itself
> -----------------------------------------------------------------
>
> Key: LUCENE-4300
> URL: https://issues.apache.org/jira/browse/LUCENE-4300
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 5.0, 3.6.2, 4.0
>
> Attachments: LUCENE-4300.patch, LUCENE-4300.patch, LUCENE-4300.patch
>
>
> Tripped by the new random sim from LUCENE-4297:
> The basics are this:
> * BooleanQuery has the following rewrite():
> {code}
> public Query rewrite(IndexReader reader) throws IOException {
> if (minNrShouldMatch == 0 && clauses.size() == 1) { //
> optimize 1-clause queries
> {code}
> * you have a coord() impl that doesnt return 1.0 if overlap == maxOverlap,
> particularly:
> {code}
> return overlap / ((float)maxOverlap + 1);
> {code}
> * TestBooleanMinShouldMatch.testRandomQueries generates random boolean
> queries (Q1), then compares the scores of the random query to the same query
> but with minNrShouldmatch applied to its should clauses (Q2)
> * in the case of a single term BQ, the rewrite applies to Q1, making it a
> term query, but not to Q2. so the coord() only gets called for Q2, not Q1.
> and with this crazy coord it means the scores are different.
> I think the rewrite is wrong, we should also rewrite single-query BQs where
> minNrShouldMatch = 1 and there is a single optional clause.
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