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The following page has been changed by CorinneC:

+ '''Note:''' For Pig 0.2.0 or later, some content on this page may no longer 
be applicable.
  == Pig User Defined Functions ==
  Pig has a number of built-in functions for loading, filtering, aggregating 
data (for a complete list, see PigBuiltins.) However, if you want to do 
something specialized, you may need to write your own Pig user defined function 
(UDF). This page walks you through the process.

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