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

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  grunt> a = load 'input1' as (x, y, z);
  grunt> b = load 'input2' as (m, n, o);
  grunt> c = cogroup a by (x, y), b by m;
- ERROR org.apache.pig.tools.grunt.GruntParser - The arity of the group by 
columns do not match.
+ ERROR org.apache.pig.tools.grunt.GruntParser - [Error 42] The arity of the 
group by columns do not match.
  
  //LOG
- ERROR org.apache.pig.tools.grunt.GruntParser - java.io.IOException: The arity 
of the group by columns do not match.
+ ERROR org.apache.pig.tools.grunt.GruntParser - [Error 42] The arity of the 
group by columns do not match.
  Stack Trace:
          at org.apache.pig.PigServer.parseQuery(PigServer.java:298)
          at org.apache.pig.PigServer.registerQuery(PigServer.java:263)

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