{"key" : "A",
 "value" : "a",
 "next" : null}
{"key" : "B",
 "value" : "b",
 "next" : {
    "org.apache.pig.test.builtin.recursiveRecord" : {
        "key" : "B1",
        "value" : "b1",
        "next" : null
    }
   }
 }
{"key" : "C",
 "value" : "c",
 "next" : {
    "org.apache.pig.test.builtin.recursiveRecord" : {
        "key" : "C1",
        "value" : "c1",
        "next" : {
            "org.apache.pig.test.builtin.recursiveRecord" : {
                "key" : "C2",
                "value" : "c2",
                "next" : null
            }
           }
    }
   }
 }
