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What would cause the following warning message?

May 05, 2019 7:08:27 PM com.complexible.stardog.plan.optimizer.FixJoinType$Visitor transform
WARNING: Invalid join detected
 MergeJoin(key=47 card=2[PROBABLY_OFF] cost=20.0)
  Canonicalize([47, 0, 48])
    PropertyPath[106K[PROBABLY_ACCURATE]](Var(47) -> Var(0) in Var(48) 1+, cost=528400.0)
      Expand(47)
        Canonicalize([47, 0, 48])
          Scan[53K[ACCURATE]](PSOC[SortType[47]], Var(47), http://ontology.causeex.com/ontology/odps/GeneralConcepts#has_component, Var(0), Var(48), scope=Default)
      Expand(0)
        Canonicalize([47, 0, 48])
          Scan[53K[ACCURATE]](PSOC[SortType[47]], Var(47), http://ontology.causeex.com/ontology/odps/GeneralConcepts#has_component, Var(0), Var(48), scope=Default)
  Canonicalize([47])
    Scan[12[ACCURATE]](POSC[SortType[47]], Var(47), http://www.w3.org/1999/02/22-rdf-syntax-ns#type, http://www.ontologyrepository.com/CommonCoreOntologies/Subcontinent, null, scope=Default)

Andrea

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