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https://issues.apache.org/jira/browse/PIG-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267347#comment-13267347
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Prashant Kommireddi commented on PIG-2470:
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Does PigStorage generate quotes in the output? 

PigStorage differs from CSVExcelStorage in that output could be any data type, 
whereas it is always String in the latter case. I feel being able to *clearly* 
distinguish between a null return (from a UDF) vs an empty string return would 
be useful. But it also makes sense if CSV storefunc is expected to behave 
similar to PigStorage. Open to both!

Thoughts?
                
> Issue with CSVEXcelStorage piggy bank function
> ----------------------------------------------
>
>                 Key: PIG-2470
>                 URL: https://issues.apache.org/jira/browse/PIG-2470
>             Project: Pig
>          Issue Type: Bug
>          Components: piggybank
>    Affects Versions: 0.9.0
>            Reporter: Priya Karkele
>            Assignee: Prashant Kommireddi
>         Attachments: PIG-2470.patch
>
>
> CSVExcelStorage piggy bank function skips the record, which has 1 or more  
> null column(s) in it. The record is not written to the file

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