Jean-Baptiste Onofré created BEAM-621:
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Summary: 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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