Examples of ivory.core.data.index.PostingsList

ivory.core.data.index.PostingsList

Interface representing a postings list, which contains a list of individual postings. The ordering of the postings depends on the concrete implementation. Postings lists may or may not store positional information.

Note that there are subtle but important differences between:

{@link #size()}, which returns the number of postings that have been added to this list (i.e., intermediate state).
{@link #getNumberOfPostings()} and {@link #setNumberOfPostings(int)}, which return and set the number of postings that will ultimately be added to this list (i.e., final state). For many encoding schemes, this is required to be known in advance (i.e., before any postings are added to the list).
{@link #getDf()}, which returns the document frequency of the term associated with this postings list. In a large collection with many document partition, this returns the global document frequency (whereas the previous two methods deal with this specific partition). In a collection with only a single partition, this is exactly the same value as {@link #getNumberOfPostings()}

@author Jimmy Lin

        PostingsListDocSortedPositional.mergeList(merged, lists, collectionDocumentCount);
        lists.clear();
        mergedList.add(PostingsListDocSortedPositional.create(merged.serialize()));
        context.getCounter(Reduce.Merges).increment(1);
      } else {
        PostingsList pl = lists.remove(0);
        pl.setCollectionDocumentCount(collectionDocumentCount);
        mergedList.add(pl);
      }


      context.getCounter(ReduceTime.Merging).increment(System.currentTimeMillis() - startTime);
      return true;

Examples of ivory.core.data.index.PostingsList

Related Classes of ivory.core.data.index.PostingsList