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https://issues.apache.org/jira/browse/PIG-4459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360581#comment-14360581
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Daniel Dai commented on PIG-4459:
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This should be the right behavior. Otherwise, the result will be the same as
when the map value is chararray. You can do a flatten to take out the tuple.
> VALUESET/VALUELIST wraps an element in a tuple even if that element is a tuple
> ------------------------------------------------------------------------------
>
> Key: PIG-4459
> URL: https://issues.apache.org/jira/browse/PIG-4459
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Ratandeep Ratti
> Labels: UDF, VALUELIST, VALUESET
> Attachments: valueset_doubly_wraps_tuples_in_map.patch
>
>
> I see that in UDFS VALUELIST/VALUESET we wrap every element in a tuple no
> matter the type of element, which means that we may wrap a tuple inside a
> tuple if the input map contains tuples as values. In our Pig loaders we
> specifically do not do this, when converting to DataBags we do not wrap
> elements in tuples which are tuple equivalents. I wondering if this is the
> intended behavior or is it a bug?
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