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https://issues.apache.org/jira/browse/DRILL-3876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944281#comment-14944281
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Jacques Nadeau commented on DRILL-3876:
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As Jason mentions, the multi-flatten case makes planning a pain since we have
to actually break these into sub-operators. If you're only looking to solve the
single flatten case, that should be easier. You would simply need to have
flatten's config also include a "pass-through fields" attribute.
I recommend implementing this as a task after implementing UDTFs. Multiflatten
could then become a special UDTF and the logic would become much simpler to
write. This would also vastly simplify the flatten rule. I'll put together a
proposal on UDTFs.
> flatten() should not require a subsequent project to strip columns that
> aren't required
> ---------------------------------------------------------------------------------------
>
> Key: DRILL-3876
> URL: https://issues.apache.org/jira/browse/DRILL-3876
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Flow
> Affects Versions: 1.2.0
> Reporter: Chris Westin
> Assignee: Chris Westin
>
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