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  1. Blazegraph (by SYSTAP)
  2. BLZG-1394

Inter-partition reordering imperfect

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    Details

    • Type: Improvement
    • Status: Done
    • Priority: Medium
    • Resolution: Done
    • Affects Version/s: None
    • Fix Version/s: BLAZEGRAPH_RELEASE_1_5_2
    • Component/s: None
    • Labels:
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      Description

      The query

      SELECT * WHERE {
        ?person rdf:type <http://example.com/Person> .
        OPTIONAL { ?person <http://example.com/image> ?image } .
        ?person rdfs:label ?label .
      }
      

      is equivalent to the query

      SELECT * WHERE {
        ?person rdf:type <http://example.com/Person> .
        ?person rdfs:label ?label .
        OPTIONAL { ?person <http://example.com/image> ?image } .
      }
      

      However, currently it is not rewritten, there seems to be an index-off-by-one problem in ASTJoinGroupOrderOptimizer.

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            Assignee:
            michaelschmidt michaelschmidt
            Reporter:
            michaelschmidt michaelschmidt
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              Updated:
              Resolved: