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https://issues.apache.org/jira/browse/PIG-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767468#action_12767468
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Yan Zhou commented on PIG-1026:
-------------------------------

The STR_STORAGE actually has a problem : m2#{x} is actually specified twice. So 
a syntax exception should have been thrown. I'm going to attach a patch that 
throws the exception in a proper manner.

After I correct the syntax error, the tests pass, particularly with "[m1#{a|b}, 
m2#{x|y}]; [m1]; [m2]" as the storage specification.

> [zebra] map split returns null
> ------------------------------
>
>                 Key: PIG-1026
>                 URL: https://issues.apache.org/jira/browse/PIG-1026
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Jing Huang
>            Assignee: Yan Zhou
>             Fix For: 0.6.0
>
>
> Here is the test scenario:
>  final static String STR_SCHEMA = "m1:map(string),m2:map(map(int))";
>   //final static String STR_STORAGE = "[m1#{a}];[m2#{x|y}]; [m1#{b}, 
> m2#{z}];[m1]";
>  final static String STR_STORAGE = "[m1#{a}, m2#{x}];[m2#{x|y}]; [m1#{b}, 
> m2#{z}];[m1,m2]";
> projection: String projection2 = new String("m1#{b}, m2#{x|z}");
> User got null pointer exception on reading m1#{b}.
> Yan, please refer to the test class:
> TestNonDefaultWholeMapSplit.java 

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