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https://issues.apache.org/jira/browse/PIG-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952484#comment-15952484
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Koji Noguchi commented on PIG-5201:
-----------------------------------
bq. This is PIG-2537, this is a bug we shall fix.
Thanks [~daijy]. Question.
PIG-2537 is about null Tuple.
I'm not convinced that same should apply to null Bag. (This is my question (1)
above)
(There is a separate question of whether runtime system can distinguish null
bag to null tuple but let's put that aside.)
To me, if Flatten(empty-bag) is defined to drop, FLATTEN(null-bag) should also
do the same.
As for my (2) FLATTEN(Bag-with-null), we probably want to follow whatever we're
going to do in PIG-2537.
> 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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