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https://issues.apache.org/jira/browse/SOLR-2883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley closed SOLR-2883.
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Resolution: Fixed
SOLR-9786 effectively incorporated such a hint. {{QParser.setIsFilter}}
> Add QParser boolean hint for filter queries
> -------------------------------------------
>
> Key: SOLR-2883
> URL: https://issues.apache.org/jira/browse/SOLR-2883
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: David Smiley
>
> It would be useful if there was a QParser hint of some kind that indicated
> that the score isn't needed. This would be set by Solr in QueryComponent when
> processing the fq param, and some field types could check for this and return
> more efficient Query implementations from FieldType.getFieldQuery(). For
> example, a geospatial field could return a ConstantScoreQuery(Filter)
> implementation when only filtering is needed, or return a query that returns
> a geospatial distance for a document's score. I think there are probably
> other opportunities for this flag to have its use but I'm not sure.
> As an example solution, a local param of needScore=false could be added. I
> should be functionally equivalent to fq={!needScore=false}.....
> Here is a modified portion of QueryComponent at line 135 to illustrate what
> the change would be. I haven't tested it but it compiles.
> {code:java}
> for (String fq : fqs) {
> if (fq != null && fq.trim().length()!=0) {
> QParser fqp = QParser.getParser(fq, null, req);
> SolrParams localParams = fqp.getLocalParams();
> SolrParams defaultLocalParams = new
> MapSolrParams(Collections.singletonMap("needScore","false"));
> SolrParams newLocalParams = new
> DefaultSolrParams(localParams,defaultLocalParams);
> fqp.setLocalParams(newLocalParams);
> filters.add(fqp.getQuery());
> }
> }
> {code}
> It would probably be best to define the "needScore" constant somewhere better
> but this is it in a nutshell.
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