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https://issues.apache.org/jira/browse/PIG-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977151#comment-15977151
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Rohini Palaniswamy commented on PIG-5201:
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bq. I don't see any reasons FLATTEN(null-bag) to behave differently.
It is hard for me to see empty and null as same. This means dropping a whole
record when one of the fields is null. I doubt users would want that. You might
want to check with a couple of them to be sure.
bq. Also, not sure how many users depend on the current FLATTEN(null) = null
given it corrupts the output in most cases.
Most of the users have bags with just one element and this shifting issue is
not a problem in those cases. Bag of strings is way more common than a bag of
tuples and that is why we have not come across this for a long time.
> 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, pig-5201-v01.patch,
> pig-5201-v02.patch
>
>
> Sometimes, FLATTEN(null) or FLATTEN(bag-with-null) seem to produce incorrect
> results.
> Test code/script to follow.
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