Syntax Error, cannot parse from lucene StandardQueryparser when using fq(filtered query)

Question

I am trying to pass a java String to Apache StandardQueryparser to get the Querynode.

Input - "fq=section:1"

All I need is section:1 in FILTER clause in QueryNode. This looks pretty straightforward but it throws

INVALID_SYNTAX_CANNOT_PARSE: Syntax Error, cannot parse fq=section:1:

Are you trying to send fq=section:1 as the input to a query parser directly in Lucene? fq is Solr syntax, it's not directly related to Lucene. Add your actual code and what you're trying to do - if you just want to add an extra condition for section:1, you can add ` AND section:1` to your query, To replicate the fq behavior to not affect score, use a ConstantScoreQuery. — MatsLindh
– MatsLindh, Commented Dec 13, 2019 at 22:07
I have a condition like (name: abc OR name: xyz) AND id:(1 2 3 ). I pass this to StandardQueryParser and it parses to 2 bool queries. Bool query 1 is a "should" clause for the OR condition above. The second bool query also gets translated to a "should" clause for id part of it. But what I want to do is "filter" for id query not "should" as "filter" performs better than "should" — dj308
– dj308, Commented Dec 15, 2019 at 3:25
You can accept the answer or tell us what is missing for you to go further. — EricLavault
– EricLavault, Commented Dec 19, 2019 at 8:59

MatsLindh · Accepted Answer · 2019-12-15 13:06:26Z

1

Use a ConstantScoreQuery. It won't affect it score, and is the same was as the fq parameter is implemented in Solr:

  public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) throws IOException {
    // SolrRequestInfo reqInfo = SolrRequestInfo.getRequestInfo();

    if (!(searcher instanceof SolrIndexSearcher)) {
      // delete-by-query won't have SolrIndexSearcher
      return new BoostQuery(new ConstantScoreQuery(q), 0).createWeight(searcher, scoreMode, 1f);
    }

    SolrIndexSearcher solrSearcher = (SolrIndexSearcher)searcher;
    DocSet docs = solrSearcher.getDocSet(q);
    // reqInfo.addCloseHook(docs);  // needed for off-heap refcounting

    return new BoostQuery(new SolrConstantScoreQuery(docs.getTopFilter()), 0).createWeight(searcher, scoreMode, 1f);
  }

answered Dec 15, 2019 at 13:06

MatsLindh

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