Marco Buccini commented on BEAM-621:

Another user opened a similar issue: 
Maybe these two need to be merged. 

> Add MapValues and MapKeys functions
> -----------------------------------
>                 Key: BEAM-621
>                 URL: https://issues.apache.org/jira/browse/BEAM-621
>             Project: Beam
>          Issue Type: New Feature
>          Components: beam-model
>            Reporter: Jean-Baptiste Onofré
>            Assignee: Jean-Baptiste Onofré
> 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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