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https://issues.apache.org/jira/browse/SOLR-16246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553588#comment-17553588
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Elia Porciani commented on SOLR-16246:
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Created a PR: https://github.com/apache/solr/pull/904
> Implement pre-filtering functionallity for KnnQParser
> -----------------------------------------------------
>
> Key: SOLR-16246
> URL: https://issues.apache.org/jira/browse/SOLR-16246
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Elia Porciani
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> At the current state of development, with KnnQParser it is possible to
> specify filter queries and the result is the intersection between:
> * top-K document founds by the KNN search
> * Results of the filter query
> As a consequence, if the filter query filters out some documents in the top-K
> results, we will have less than K results in the result set.
> The proposal is to leverage the recent Apache Lucene development
> [LUCENE-10382|https://issues.apache.org/jira/browse/LUCENE-10382] to change
> the behavior of the filter queries in the KnnQParser in such a way:
> * The filter query works as pre-filtering
> * KNN Search retrieves the top-K results among the documents that are not
> filtered out.
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