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The following page has been changed by SanthoshSrinivasan:
http://wiki.apache.org/pig/PigErrorHandlingFunctionalSpecification

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  == Requirement on UDF authors ==
  
- In order to enable warning message aggregation, UDF authors should use Hadoop 
counters to report warnings. UDF authors should use Pig's warning enumeration 
constant UDF_WARNING in order to aggregate UDF warning messages.
+ In order to enable warning message aggregation, UDF authors should use Pig's 
abstraction to handle warning message aggregation. For more details refer to 
the design document.
  
  === Warning Codes ===
  
@@ -66, +66 @@

  
  '''Note'''
  
-    1. Java does not allow enum types to be extended. Due to this limitation, 
UDF_WARNING is used as a placeholder for aggregating UDF warning messages. As a 
result, all warning messages reported by UDFs are treated uniformly.
-    2. The exact warning codes along with the warning messages are to be 
decided.
+    1. The exact warning codes along with the warning messages are to be 
decided.
  
  == Additional command line switches ==
  

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