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https://issues.apache.org/jira/browse/PIG-2726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13393642#comment-13393642
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Daniel Dai commented on PIG-2726:
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Is there any way to distinguish unknown and string "unknown"?
> Handling legitimate NULL values
> -------------------------------
>
> Key: PIG-2726
> URL: https://issues.apache.org/jira/browse/PIG-2726
> Project: Pig
> Issue Type: Sub-task
> Affects Versions: 0.11
> Reporter: Prasanth J
> Assignee: Prasanth J
> Attachments: PIG-2726.1.patch
>
>
> Look into SQL/Oracle server for how they are handling legitimate NULL values
> in the input while performing operations like roll-up, filtering etc. Current
> implementation outputs NULL string which should be replaced by actual null
> value.
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