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  1. Lucene - Core
  2. LUCENE-4586

Change default ResultMode of FacetRequest to PER_NODE_IN_TREE

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • None
    • 4.1, 6.0
    • modules/facet
    • None
    • 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
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          February
        2011
          April
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      • 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

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            shaie Shai Erera
            shaie Shai Erera
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            Dates

              Created:
              Updated:
              Resolved: