solr - Lucene同时使用分类法和DocValues方面

Question

有许多基于分类索引和DocValues使用构面的示例。但是我需要将类别(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()。将 MultiCollector.wrap(FacetsCollector，TopScoreDocCollector)传递为 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 结果.facet 包含空值，这是指 DocValues 方面。

也许您有一个有效的示例，如何将 中的分类法和 DocValues 方面一起使用DrillSideways 。

Answer 1

DrillSideways假定您仅使用TaxonomyFacets或SortedSetDocValuesFacets。如果不是这种情况，则可以继承DrillSideways的子类，并覆盖buildFacetsResult方法来构建最终的Facet(如果您愿意)。对于您添加到DrissSideways中的每个暗角，您将获得用于DrillDownQuery的FacetsCollector和两个带有侧面FacetCollectors和暗角的数组。

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);
  }
}