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https://issues.apache.org/jira/browse/LUCENE-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662814#action_12662814
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Paul Elschot commented on LUCENE-1345:
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In case there is no score value for each matching document it is not possible
to order the results to be presented to a user. Because of that I don't want
BooleanQuery to run correctly without at least one normal query clause to
provide a score to order the results. Putting this in another way: TopDocs (and
the meanwhile deprecated Hits) make no sense without at least one normal query
clause.
There are cases when all results are needed, and in that case for a Query one
normally uses to the HitCollector API. For Filters one could provide a
MatchCollector API that collects all hits providing only the document numbers,
and no score (as in HitCollector). This was part of the earlier versions of the
patches at LUCENE-584 that introduced the new Filter API, but it was dropped
because it was new functionality that was not really needed at the time.
The same MatchCollector API can also be provided for Query searching. At that
point, there is no difference between Query and Filter.
> 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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