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https://issues.apache.org/jira/browse/PIG-653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672015#action_12672015
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Hong Tang commented on PIG-653:
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Should subFields also have the type RequiredFieldList?

> Make fieldsToRead work in loader
> --------------------------------
>
>                 Key: PIG-653
>                 URL: https://issues.apache.org/jira/browse/PIG-653
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Alan Gates
>            Assignee: Pradeep Kamath
>         Attachments: PIG-653-2.comment
>
>
> Currently pig does not call the fieldsToRead function in LoadFunc, thus it 
> does not provide information to load functions on what fields are needed.  We 
> need to implement a visitor that determines (where possible) which fields in 
> a file will be used and relays that information to the load function.

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