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https://issues.apache.org/jira/browse/PIG-653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672176#action_12672176
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Hong Tang commented on PIG-653:
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my quibble is that the interface uses null to indicate all required for nested
fields, but uses a concrete class for top level fields. any justification why
possible future extensions are only applicable to top-level fields but not
nested fields?
> 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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