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

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  Pig comes with a set of builtin in functions. (NEED LINK) Two main properties 
differentiate builtin functions from UDFs. First, they don't need to be 
registered because Pig knows where they are. Second, they don't need to be 
qualified when used because Pig knows where to find them.
  
- In addition to builtins, Pig hosts a UDF repository called `piggybank` that 
allows users to share UDFs that they have written. The details are described in 
http://wiki.apache.org/pig/PiggyBank][PiggyBank.
+ In addition to builtins, Pig hosts a UDF repository called `piggybank` that 
allows users to share UDFs that they have written. The details are described in 
[http://wiki.apache.org/pig/PiggyBank PiggyBank].
  
  [[Anchor(Advanced_Topics)]]
  == Advanced Topics ==

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