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https://issues.apache.org/jira/browse/PIG-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122081#comment-16122081
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Koji Noguchi commented on PIG-5201:
-----------------------------------

bq. What's your idea for the column padding?
I don't remember much on what I tried on this jira but my patch seems like it's 
trying to pad null inside POForeach when flatten is called.  
Utf8StorageConverter is just one type of loadcaster, so we cannot assume all 
the data use this loadcaster.  At least not for fixing a data correctness issue 
like this one.

> Null handling on FLATTEN
> ------------------------
>
>                 Key: PIG-5201
>                 URL: https://issues.apache.org/jira/browse/PIG-5201
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>            Priority: Minor
>             Fix For: 0.18.0
>
>         Attachments: pig-5201-v00-testonly.patch, pig-5201-v01.patch, 
> pig-5201-v02.patch, pig-5201-v03.patch
>
>
> Sometimes, FLATTEN(null) or FLATTEN(bag-with-null) seem to produce incorrect 
> results.
> Test code/script to follow.



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