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https://issues.apache.org/jira/browse/PIG-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977166#comment-15977166
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Koji Noguchi commented on PIG-5201:
-----------------------------------
bq. It is hard for me to see empty and null as same.
We defined FLATTEN(empty-bag) to drop since "Crossing a set S with the empty
set results in the empty set.".
To be consistent, FLATTEN(null-bag) should behave the same.
Anyways, we can continue the discussion once you're back next month. Let's
keep the jira open till then.
> 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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