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https://issues.apache.org/jira/browse/SOLR-12336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17492080#comment-17492080
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ASF subversion and git services commented on SOLR-12336:
--------------------------------------------------------

Commit db7ffcecd6e8f4e8f4cae18d3839d4c0998633f4 in solr's branch 
refs/heads/branch_9_0 from Collins Abanda
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=db7ffce ]

SOLR-12336 Remove Filter from Solr (#529)

Includes:

* Remove Filter from Solr and replace with Lucene Query
* Remove SolrConstantScoreQuery and all its usages
* SOLR-15257 Add DocSetQuery to replace some usage of Filter

(cherry picked from commit ef4e7e124bdf55b12210052d8b2b5ff5ce447253)
(cherry picked from commit 544ac12370d6caf9ccc47e557d7743fdcef9784a)


> Remove Filter from Solr
> -----------------------
>
>                 Key: SOLR-12336
>                 URL: https://issues.apache.org/jira/browse/SOLR-12336
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Major
>             Fix For: 9.0
>
>          Time Spent: 10.5h
>  Remaining Estimate: 0h
>
> Over a series of Lucene releases, the old Filter was made to extend Query 
> (LUCENE-1518) and then was removed from Lucene (moved to Solr in 
> LUCENE-6583); BooleanClause.Occur.FILTER (LUCENE-6227) with some other API 
> enhancements including TwoPhaseIterator replaced the need for the old Filter. 
>  Filter is now a Solr thing, and there are various related classes like 
> QueryWrapperFilter and SolrConstantScoreQuery that depend on it.  We should 
> remove some of this technical-debt / bit-rot, making refactorings as needed 
> to retain functionality.  Leaving things as-is is needless complexity and can 
> impede performance when there is needless wrapping/layers.
> CC @yonik



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