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  1. Apache Jena
  2. JENA-90

Use OpReduce instead of OpDistinct for DISTINCT + ORDER BY queries

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: 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.

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              • Assignee:
                castagna Paolo Castagna
                Reporter:
                castagna Paolo Castagna
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