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The following page has been changed by OlgaN:
http://wiki.apache.org/pig/PigStreamingFunctionalSpec

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  The following serializers/deserializer will be part of pig distribution:
  
   1. !DefaultSerializer, !DefaultDeserializer as described above
-  2. !DontFlattenSerializer - it would not flatten bags.
-  3. !PythonSerializer, !PythonDeserializer 
+  2. !PythonSerializer, !PythonDeserializer 
+ 
+ Each deserializer will be implementing `LoadFunc` interface. Each serializer 
will be implementing `StoreFunc` interface. `StoreFunc` interface will be 
extended with `void flatten() throws OperationNotSupportedException;` method 
that would indicate that the data needs to be flattened before it is 
serialized. The class can choose not to support this functionality and through 
an exception.
  
  ==== 3.2 Ability to declare schema for streaming output ====
  

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