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From "xuting zhao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2404) NullPointerException when I have multiple python udfs
Date Thu, 08 Dec 2011 20:02:41 GMT

    [ https://issues.apache.org/jira/browse/PIG-2404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165497#comment-13165497
] 

xuting zhao commented on PIG-2404:
----------------------------------

Hi I am new to python and I have got one question about this problem: For the b.py in the
example, Do we need to define some schemaFunction like those examples in "Programming Pig"?
I built a unit test in trunk with extra schemaFunction in b.py and it seems work with those
duplicate registrations. 

                   @outputSchemaFunction(squareSchema),
                   def square(number): 
                   return (number * number)
                   @schemaFunction(square)
                   def squareSchema(input):
                   return input
Thanks.
Xuting
                
> NullPointerException when I have multiple python udfs
> -----------------------------------------------------
>
>                 Key: PIG-2404
>                 URL: https://issues.apache.org/jira/browse/PIG-2404
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.1, 0.9.1
>            Reporter: Vivek Padmanabhan
>            Assignee: xuting zhao
>             Fix For: 0.9.2
>
>
> When I have multiple python udfs registered, the script fails at compile phase while
trying to get the udf ouputschema.
> {code}
> register 'a.py' using org.apache.pig.scripting.jython.JythonScriptEngine as a_func;
> register 'b.py' using org.apache.pig.scripting.jython.JythonScriptEngine as b_func;
> a = load 'i1' as (f1:chararray);
> b = foreach a generate a_func.helloworld(), b_func.square(3);
> dump b;
> {code}
> a.py 
> {code}
> @outputSchema("word:chararray")
> def helloworld():  
>   return 'Hello, World'
> {code}
> b.py 
> {code}
> @outputSchemaFunction("squareSchema")
> def square(num):
>   return ((num)*(num))
> {code}
> Moreover , in the log we can see duplicate and incorrect registration of udfs which I
believe the cause for the script failure.
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: a_func.helloworld
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: b_func.square
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: b_func.helloworld
> This issue is observed in 0.9,0.8 and  in trunk also.

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