Package org.openrdf.query.algebra

Examples of org.openrdf.query.algebra.EmptySet

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      TupleExpr leftArg = join.getLeftArg();
      TupleExpr rightArg = join.getRightArg();

      if (leftArg instanceof EmptySet || rightArg instanceof EmptySet) {
        join.replaceWith(new EmptySet());
      }
      else if (leftArg instanceof SingletonSet) {
        join.replaceWith(rightArg);
      }
      else if (rightArg instanceof SingletonSet) {
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      }
      else if (rightArg instanceof EmptySet) {
        difference.replaceWith(leftArg);
      }
      else if (leftArg instanceof SingletonSet && rightArg instanceof SingletonSet) {
        difference.replaceWith(new EmptySet());
      }
    }
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    else if (projList.size() > 1) {
      result = new MultiProjection(result, projList);
    }
    else {
      // Empty constructor
      result = new EmptySet();
    }

    return result;
  }
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Related Classes of org.openrdf.query.algebra.EmptySet

  • org.openrdf.query.algebra.evaluation.impl.QueryModelPruner$TreeSanitizer
  • org.openrdf.query.algebra.evaluation.impl.SameTermFilterOptimizer$SameTermFilterVisitor
  • org.openrdf.query.parser.serql.ConstructorBuilder
  • org.openrdf.query.parser.sparql.TupleExprBuilder
  • org.openrdf.sail.federation.optimizers.EmptyPatternOptimizer
  • org.openrdf.sail.federation.optimizers.FederationJoinOptimizer
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