语法错误，使用 fq（过滤查询）时无法从 lucene StandardQueryparser 解析

Question

我正在尝试将 java 字符串传递给 Apache StandardQueryparser 以获取查询节点。

输入 - "fq=section:1"

我只需要 section:1 在 QueryNode 的 FILTER 子句中。这看起来很简单，但它会抛出

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

Answer 1

使用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);
  }