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https://issues.apache.org/jira/browse/LUCENE-3347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072239#comment-13072239
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Uwe Schindler commented on LUCENE-3347:
---------------------------------------
That's indeed a bug, your workaround is the correct fix. In my opinion, the
original query's boost should be multiplied, else it makes it impossible on the
other hand to modify the final score by a boost attribute:
{code:java}
q.setBoost(q.getBoost() * DOMUtils.getAttribute(e, "boost", 1.0f));
{code}
So
{noformat}
<UserQuery fieldName="Vehicle.Colour" boost="2.0">black^0.01</UserQuery>
{noformat}
would produce a boost of 0.02. This is especially important for combined
queries.
You bug occurs because for the first clauses, the userquery nodes produce
itsself a BooleanQuery, but with boost 1.0 on top-level. So the fix behaves
identical here.
> XMLparser drops user boosting
> -----------------------------
>
> Key: LUCENE-3347
> URL: https://issues.apache.org/jira/browse/LUCENE-3347
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 3.1
> Reporter: moogie
> Priority: Minor
> Fix For: 3.4, 4.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The lucene XML parser seems to convert user defined boosting back to default
> 1.0 and thus boosting value is dropped from the query...
> e.g.
> <BooleanQuery>
> <Clause occurs="must">
> <BooleanQuery>
> <Clause occurs="should">
> <UserQuery fieldName="Vehicle.Colour">red^66
> blue~^8</UserQuery>
> </Clause>
> </BooleanQuery>
> </Clause>
> <Clause occurs="should">
> <BooleanQuery>
> <Clause occurs="should">
> <UserQuery
> fieldName="Vehicle.Colour">black^0.01</UserQuery>
> </Clause>
> </BooleanQuery>
> </Clause>
> </BooleanQuery>
> produces a lucene query: +( ( Vehicle.Colour:red^66 Vehicle.Colour:blue~0.5^8
> ) ) ( Vehicle.Colour:black )
> The expected query : +( ( Vehicle.Colour:red^66 Vehicle.Colour:blue~0.5^8 ) )
> ( Vehicle.Colour:black^0.01 )
> I have developed a work around by modifying line 77 of
> UserInputQueryBuilder.java
> from:
> q.setBoost(DOMUtils.getAttribute(e,"boost",1.0f));
> to:
> q.setBoost( DOMUtils.getAttribute( e, "boost", q.getBoost() ) );
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