Lucene 一起使用分类法和 DocValues 切面

Question

有许多基于分类索引和 DocValues 的方面的使用示例。但是我需要将作为层次结构的类别（taxonomy）和范围查询（NumericDocValuesField）一起使用。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() 中创建并且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方面：

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

还列出result.facets包含空值，指的是DocValuesfacet.

也许你有一个工作示例如何在 DrillSideways[=35= 中使用 taxonomy 和 DocValues facets ]一起

Answer 1

DrillSideways 假设您只使用 TaxonomyFacets 或 SortedSetDocValuesFacets。如果不是这种情况，您可以将 DrillSideways 子类化并覆盖 buildFacetsResult 方法来构建您喜欢的最终 Facets。您将获得 DrillDownQuery 的 FacetsCollector 和两个带有横向 FacetCollectors 和 dims 的数组，对于您添加到 DrissSideways 的每个暗淡。

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);
  }
}

Lucene 一起使用分类法和 DocValues 切面

Lucene use taxonomy and DocValues facets together

lucene

solr

taxonomy

facet

elasticsearch