Lucene一起使用分类法和DocValues方面

Question

有许多基于分类索引和DocValues使用构面的示例。 但我需要将类别（分类法）和范围查询（NumericDocValuesField）一起用作层次结构。 例如DrillSideways：

  DrillSideways ds = new DrillSideways (searcher, config, taxoReader);
  DrillSideways.DrillSidewaysResult result = ds.search (q, topScoreDocCollector);

ds.search（）的第二个参数是TopScoreDocCollector 。

FacetsCollector在ds.search（）内部创建，因此无法将此收集器传递给ds.search（） 。 传递MultiCollector.wrap（FacetsCollector，TopScoreDocCollector）作为ds.search（）中的第二个参数不正确（？）。 但是， FacetsCollector需要构建分类索引中不可用的构面：

 Facets facetsTime = new LongRangeFacetCounts (..., FacetsCollector, ...);
 facetsTime.getTopChildren (...);

还列出result.facet包含null值，该值引用DocValues facet。

也许您有一个可行的示例，如何在DrillSideways中一起使用分类法和DocValues方面。

Answer 1

DrillSideways假定您仅使用TaxonomyFacets或SortedSetDocValuesFacets。 如果不是这种情况，则可以对DrillSideways进行子类化，并覆盖buildFacetsResult方法以构建最终的Facet（如果您愿意）。 您将获得用于DrillDownQuery的FacetsCollector和两个带有侧面FacetCollectors和暗淡的数组，对于您添加到DrissSideways中的每个暗淡而言。

这是一个例子：

public class MyDrillSideways extends DrillSideways {

  public MyDrillSideways(IndexSearcher searcher, FacetsConfig config, TaxonomyReader taxoReader) {
    super(searcher, config, taxoReader);
  }

  @Override
  protected Facets buildFacetsResult(FacetsCollector drillDowns, FacetsCollector[] drillSideways, String[] drillSidewaysDims) throws IOException {

    String longRangeFacetDim = "mySpecialLongRangeDim";
    Facets drillDownFacets = new FastTaxonomyFacetCounts(taxoReader, config, drillDowns);

    boolean foundLongRangeInDrillSideways = false;
    Map<String, Facets> drillSidewaysFacets = new HashMap<>();
    if (drillSideways != null) {
      for (int i = 0; i < drillSideways.length; i++) {
        String sidewaysDim = drillSidewaysDims[i];
        FacetsCollector drillSideway = drillSideways[i];

        Facets sidewaysFacets;
        if (sidewaysDim.equals(longRangeFacetDim)) {
          foundLongRangeInDrillSideways = true;
          sidewaysFacets = new LongRangeFacetCounts(...,drillSideway,...);
        } else {
          sidewaysFacets = new FastTaxonomyFacetCounts(taxoReader, config, drillSideway);
        }
        drillSidewaysFacets.put(sidewaysDim, sidewaysFacets);
      }
    }

    if (!foundLongRangeInDrillSideways) {
      Facets facetsTime = new LongRangeFacetCounts(..., FacetsCollector, ...);
      drillSidewaysFacets.put(longRangeFacetDim, facetsTime);
    }

    return new MultiFacets(drillSidewaysFacets, drillDownFacets);
  }
}