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  1. Apache Jena
  2. JENA-111

Improving TopN optimization in case of an intermediate OpModifier

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Done
    • None
    • Jena 2.11.0
    • ARQ

    Description

      In the TopN optimization (Jena-89) it would be useful to handle also the case in which there are some other OpModifiers (I think they are the only category of Ops that can be in that position in the tree) between Slice and Order By, for example OpProject:

      (slice _1
      (project ?s ...
      (order by <condition>

      ->
      (project ?s ...
      (top 1 <condition>

      Attachments

        1. topk_project.patch
          2 kB
          Sara Magliacane
        2. JENA-111_ARQ_r1165795.patch
          12 kB
          Paolo Castagna

        Issue Links

          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. JENA-114 Enabling slice(0,N)-project-order optimization cause "open iterator" warnings.

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. JENA-89 Avoid a total sort for ORDER BY + LIMIT queries

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Activity

            People

              castagna Paolo Castagna
              sara.magliacane Sara Magliacane
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              Dates

                Created:
                Updated:
                Resolved: