Uploaded image for project: 'Lucene - Core'
  1. Lucene - Core
  2. LUCENE-4586

Change default ResultMode of FacetRequest to PER_NODE_IN_TREE

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.1, 6.0
    • Component/s: modules/facet
    • Labels:
      None
    • Lucene Fields:
      New, Patch Available

      Description

      Today the default ResultMode is GLOBAL_FLAT, but it should be PER_NODE_IN_TREE. ResultMode is being used whenever you set the depth of FacetRequest to greater than 1. The difference between the two is:

      • PER_NODE_IN_TREE would then compute the top-K categories recursively, for every top category at every level (up to depth). The results are returned in a tree structure as well. For instance:
      Date
        2010
          March
          February
        2011
          April
          May
      
      • GLOBAL_FLAT computes the top categories among all the nodes up to depth, and returns a flat list of categories.

      GLOBAL_FLAT is faster to compute than PER_NODE_IN_TREE (it just computes top-K among N total categories), however I think that it's less intuitive, and therefore should not be used as a default. In fact, I think this is kind of an expert usage.

        Attachments

        1. LUCENE-4586.patch
          9 kB
          Shai Erera
        2. LUCENE-4586.patch
          9 kB
          Shai Erera

          Activity

            People

            • Assignee:
              shaie Shai Erera
              Reporter:
              shaie Shai Erera
            • Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: