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https://issues.apache.org/jira/browse/PIG-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15954167#comment-15954167
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Daniel Dai commented on PIG-5201:
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Thanks for pointing out, yes, PIG-2537 is for tuple, for bag, I agree null bag
should drop (same as empty bag), bag with null item should generating according
to schema (same as PIG-2537), in case no schema, we can generate single null
column.
> 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
> Attachments: pig-5201-v00-testonly.patch
>
>
> Sometimes, FLATTEN(null) or FLATTEN(bag-with-null) seem to produce incorrect
> results.
> Test code/script to follow.
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