Examples of cascading.pipe.joiner.RightJoin$JoinIterator

cascading.pipe.joiner.RightJoin
Class RightJoin will return an {@link Iterator} that will iterate over a given {@link Joiner} and return tuples that representa left outer, right inner join of the CoGrouper internal grouped tuple collections.
Note only the farthest left tuple stream will be used as the outer join. All following joins to the right will be inner joins. See {@link MixedJoin} for more flexibility.
Joins perform based on the equality of the join keys. In the case of null values, Java treats two null values as equivalent. SQL does not treat null values as equal. To produce SQL like results in a given join, a new {@link java.util.Comparator} will need to be used on the joined values to prevent null fromequaling null. As a convenience, see the {@link cascading.util.NullNotEquivalentComparator} class. @see MixedJoin

    results.add( new Tuple( "4", "d3", "4", "D1" ) );
    results.add( new Tuple( null, null, "6", "F1" ) );
    results.add( new Tuple( null, null, "6", "F2" ) );
    results.add( new Tuple( null, "h1", null, "H1" ) );


    handleJoins( "cogroupouterinner", new RightJoin(), results, 8, false, null );
    handleJoins( "cogroupouterinner-resultgroup", new RightJoin(), results, 8, true, null );
    }

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    results.add( new Tuple( "4", "d3", "4", "D1" ) );
    results.add( new Tuple( null, null, "6", "F1" ) );
    results.add( new Tuple( null, null, "6", "F2" ) );
    results.add( new Tuple( null, null, null, "H1" ) );


    handleJoins( "cogroupouterinnernull", new RightJoin(), results, 9, false, new NullNotEquivalentComparator() );
    handleJoins( "cogroupouterinnernull-resultgroup", new RightJoin(), results, 9, true, new NullNotEquivalentComparator() );
    }

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//    fielded = new Each( fielded, new Debug( true ) );


    Pipe inner = new CoGroup( "inner", fielded, new Fields( 0 ), uniques, new Fields( "word" ), new InnerJoin() );
    Pipe outer = new CoGroup( "outer", fielded, new Fields( 0 ), uniques, new Fields( "word" ), new OuterJoin() );
    Pipe left = new CoGroup( "left", fielded, new Fields( 0 ), uniques, new Fields( "word" ), new LeftJoin() );
    Pipe right = new CoGroup( "right", fielded, new Fields( 0 ), uniques, new Fields( "word" ), new RightJoin() );


    Pipe[] heads = Pipe.pipes( uniques, fielded );
    Map<String, Tap> sources = Cascades.tapsMap( heads, Tap.taps( source, source ) );


    Pipe[] tails = Pipe.pipes( inner, outer, left, right );

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    results.add( new Tuple( "4", "d3", "4", "D1" ) );
    results.add( new Tuple( null, null, "6", "F1" ) );
    results.add( new Tuple( null, null, "6", "F2" ) );
    results.add( new Tuple( null, "h1", null, "H1" ) );


    handleJoins( "joinouterinner", new RightJoin(), results );
    }

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    Tap sink = new Hfs(new TextLine(), getTestRoot() + "/output");


    Pipe lhsPipe = new Pipe("lhs");
    Pipe rhsPipe = new Pipe("rhs");


    Pipe joined = new BloomJoin(rhsPipe, new Fields("key"), lhsPipe, new Fields("key"), new Fields("key", "key2", "lhs-value", "key-copy", "key2-copy", "rhs-value"), new RightJoin(), BloomAssembly.CoGroupOrder.LARGE_RHS);


    CascadingUtil.get().getFlowConnector().connect(sources, sink, joined).complete();


    List<Tuple> results = TapHelper.getAllTuples(sink);
    assertEquals("All tuples from the right side should be kept", 21, results.size());

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      case INNER:
        return new InnerJoin();
      case LEFT:
        return new LeftJoin();
      case RIGHT:
        return new RightJoin();
      case FULL:
        return new OuterJoin();
      default:
        throw new IllegalStateException( "unknown join type" );
      }

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Related Classes of cascading.pipe.joiner.RightJoin$JoinIterator

cascading.CoGroupFieldedPipesPlatformTest

cascading.JoinFieldedPipesPlatformTest

cascading.lingual.optiq.CascadingJoinRel

cascading.tuple.Tuple

com.liveramp.cascading_ext.assembly.TestBloomJoin

lupos.datastructures.bindings.Bindings

lupos.datastructures.queryresult.QueryResult

org.apache.drill.common.exceptions.DrillRuntimeException

java.util.Iterator

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