Apache Jena
  1. Apache Jena
  2. JENA-90

Use OpReduce instead of OpDistinct for DISTINCT + ORDER BY queries

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Trivial Trivial
    • Resolution: Done
    • Affects Version/s: None
    • Fix Version/s: Jena 2.11.0
    • Component/s: ARQ
    • Labels:

      Description

      ARQ's optimizer could use an OpReduce instead of OpDistinct if a query is DISTINCT + ORDER BY.
      OpReduce removes adjacent duplicates and it does not require a set of already seen bindings as the current OpDistinct implementation does.

        Issue Links

          Activity

            People

            • Assignee:
              Paolo Castagna
              Reporter:
              Paolo Castagna
            • Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development