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https://issues.apache.org/jira/browse/LUCENE-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662907#action_12662907
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Paul Elschot commented on LUCENE-1345:
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To add a Filter is as a clause to a BooleanQuery, I would prefer to not give it
a Weight. Instead I'd like the addition of a required Filter to behave exactly
like the current Searcher(Query, Filter) API.
That also touches another point: backward compatibility with BooleanQuery and
Searcher.
It's certainly possible to add scoring behaviour to a Filter when it is added
to a BooleanQuery. A default score value could be used, and also a default
coordination behaviour.
In principle it is also possible to add a disjunction of Filters to a
BooleanQuery, even with a minimum number of required filters. For this case a
score value does make sense.
Required Filters and for prohibited Filters could be added to a BooleanQuery
without scoring behaviour. In fact, for prohibited Queries, the score value is
never used, so one might even constrain prohibited clauses to be Filters only.
Most, if not all, of the scoring behaviour for Filters that was discussed so
far can be obtained by using a ConstantScoreQuery based on a Filter and adding
it to a BooleanQuery. So I think it would be cleaner to keep the scoring yes/no
distinction between Queries and Filters. In case a simplified interface is
desired this could then use any of the options available, for example always
wrapping a Filter in a ConstantScoreQuery, and then composing a BooleanQuery
only from Query clauses.
> Allow Filter as clause to BooleanQuery
> --------------------------------------
>
> Key: LUCENE-1345
> URL: https://issues.apache.org/jira/browse/LUCENE-1345
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Paul Elschot
> Priority: Minor
> Fix For: 2.9
>
> Attachments: booleansetperf.txt, DisjunctionDISI.java,
> DisjunctionDISI.patch, DisjunctionDISI.patch,
> LUCENE-1345-Filter+Query-merge.patch, LUCENE-1345.patch, LUCENE-1345.patch,
> OpenBitSetIteratorExperiment.java, TestIteratorPerf.java,
> TestIteratorPerf.java
>
>
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