lucene - 带有自定义排序字段或 TopScoreDocCollector 的 Lucene DrillSideways

Question

我正在尝试使用 Lucene 4.6.1 实现 Drillsideways 搜索。以下代码工作正常：

DrillSideways ds = new DrillSideways(searcher, taxoReader);
FacetSearchParams fsp = new FacetSearchParams(getAllFacetCounts());

DrillDownQuery ddq = new DrillDownQuery(fsp.indexingParams, mainQuery);

List<CategoryPath> paths = new ArrayList<CategoryPath>();
...
add category path
...
if (paths.size() >0)
    ddq.add(paths.toArray(new CategoryPath[paths.size()]));

DrillSidewaysResult dsr = ds.search(null, ddq, 500, fsp); // <-- here
TopDocs topDocs = dsr.hits;
ScoreDoc[] hits = topDocs.scoreDocs;

// list search results
listSearchResults(searcher, hits, Math.min(500, topDocs.totalHits));

但是如果我想通过 TopScoreDocCollector 怎么办，比如

// for now it is top score collector,
// but I may want to implement custom sort
TopScoreDocCollector topDocsCollector = TopScoreDocCollector.create(500, true);
DrillSidewaysResult dsr = ds.search(ddq, topDocsCollector, fsp);

结果是空集，没有错误。怎么了？

Answer 1

我猜你指的是 的值DrillSidewaysResult.hits，它是预期的行为，如文档中所述DrillSidewaysResult：

请注意，如果您调用了 DrillSideways.search(DrillDownQuery, Collector, FacetSearchParams)，那么命中将为空。

您应该从中获得成功Collector。