apache pig - how to convert tuple to comma seperated string in pig -

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How do I convert the string pig a tuple?

For example, 

  {( "Lost"), ( "Law and Order")}   
 The  
  "Lost, law & order"   
 generated FOREACH my_programs ...   
 
 
 If your my_programs can contain only two fields, you can use CONCAT. Otherwise you should make a custom UDF.    FORAECH my_programs generated CONCAT ($ 0, CONCAT (',', $ 1));

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