Pipe results = new MultiGroupBy(new Pipe[]{s1, s2},
new Fields[]{new Fields("key"), new Fields("key")},
new Fields("key"),
new CustomBuffer(new Fields("result", " result1", "result2", "result3", "result4", "result5")));
results = new Each(results, new Fields("key"), new FilterNull());
CascadingUtil.get().getFlowConnector().connect(sources, sink, results).complete();
TupleEntryIterator iter = sink.openForRead(CascadingUtil.get().getFlowProcess());