Examples of MinimumUnionLeftOuterJoinImpl

org.jrdf.query.relation.operation.mem.union.MinimumUnionLeftOuterJoinImpl
Uses tuple subsumption, from minimum outer union, to compute the left outer join in two operations instead of three. Tuple subsumption means going through the results and removing the results for a given attribute binding that have null values. Or if one has a null value and another has a bound value choosing the bound value (if it's on the left hand side relation).

Examples of org.jrdf.query.relation.operation.mem.union.MinimumUnionLeftOuterJoinImpl

    }


    private DyadicJoin getLeftOuterJoin(TupleEngine unionTupleEngine, NadicJoin join) {
        SubsumptionEngine subsumptionEngine = new SubsumptionEngine(TUPLE_FACTORY, RELATION_HELPER);
        Union minUnion = new MinimumUnionImpl(RELATION_PROCESSOR, unionTupleEngine, subsumptionEngine);
        return new MinimumUnionLeftOuterJoinImpl(join, minUnion);
    }

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