Add QParser boolean hint for filter queries
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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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