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https://issues.apache.org/jira/browse/LUCENE-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155958#comment-13155958
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Uwe Schindler commented on LUCENE-668:
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>From the architecture of Lucene you *always* reexcute queries, even on paging
>results. There is nothing wrong with that. Adding additional Filters to
>results is just the way how it works. Compare e.g. Solr fq=??? parameters to
>drill down by facets.
> Incremental Search
> ------------------
>
> Key: LUCENE-668
> URL: https://issues.apache.org/jira/browse/LUCENE-668
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 1.9, 2.0.0, 2.1
> Environment: All
> Reporter: Fernando Mato Mira
> Priority: Minor
>
> Add full support for long searches executed in steps.
> QueryFilters only support narrowing down a set of results, they don't allow
> extending it with OR clauses. They also don't allow to add new clauses to
> SpanQueries.
> This facility is needed because repeatedly creating new queries and executing
> a full, more complicated query at each step is not efficient for search
> sessions where you may have chains of hundreds of such steps.
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