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https://issues.apache.org/jira/browse/LUCENE-6590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15137885#comment-15137885
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ASF subversion and git services commented on LUCENE-6590:
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Commit 340dc9ca5039244b2a78e284dd707e4466b3f3d4 in lucene-solr's branch
refs/heads/branch_5_4 from [~andyetitmoves]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=340dc9c ]
SOLR-8418: Adapt to changes in LUCENE-6590 for use of boosts with MLTHandler
and Simple/CloudMLTQParser
git-svn-id:
https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_5_4@1725144
13f79535-47bb-0310-9956-ffa450edef68
> Explore different ways to apply boosts
> --------------------------------------
>
> Key: LUCENE-6590
> URL: https://issues.apache.org/jira/browse/LUCENE-6590
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 5.4
>
> Attachments: LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch,
> LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch, LUCENE-6590.patch
>
>
> Follow-up from LUCENE-6570: the fact that all queries are mutable in order to
> allow for applying a boost raises issues since it makes queries bad cache
> keys since their hashcode can change anytime. We could just document that
> queries should never be modified after they have gone through IndexSearcher
> but it would be even better if the API made queries impossible to mutate at
> all.
> I think there are two main options:
> - either replace "void setBoost(boost)" with something like "Query
> withBoost(boost)" which would return a clone that has a different boost
> - or move boost handling outside of Query, for instance we could have a
> (immutable) query impl that would be dedicated to applying boosts, that
> queries that need to change boosts at rewrite time (such as BooleanQuery)
> would use as a wrapper.
> The latter idea is from Robert and I like it a lot given how often I either
> introduced or found a bug which was due to the boost parameter being ignored.
> Maybe there are other options, but I think this is worth exploring.
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