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https://issues.apache.org/jira/browse/BEAM-621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17132513#comment-17132513
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Beam JIRA Bot commented on BEAM-621:
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This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Add MapValues and MapKeys functions
> -----------------------------------
>
> Key: BEAM-621
> URL: https://issues.apache.org/jira/browse/BEAM-621
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core, sdk-py-core
> Reporter: Jean-Baptiste Onofré
> Assignee: Jean-Baptiste Onofré
> Priority: P2
> Labels: newbie, stale-assigned, starter
>
> Currently, we have the {{MapElements}} {{PTransform}} that "convert" a
> {{PCollection}} of {{KV}} to another {{PCollection}} (for instance
> {{String}}).
> A very classic mapping function is to just have the keys or values of {{KV}}.
> To do it currently, we can use {{MapElements}} or a generic {{ParDo}} (with
> {{DoFn}}).
> It would be helpful and reduce the user code to have {{MapValues}} and
> {{MapKeys}}. It would take a {{PCollection}} of {{KV}}: {{MapKeys}} will map
> the input {{PCollection}} to a {{PCollection}} of {{K}} and {{MapValues}} to
> a {{PCollection}} of {{V}}.
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