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From Jean-Baptiste Onofré (JIRA) <j...@apache.org>
Subject [jira] [Created] (BEAM-621) Add MapValues and MapKeys functions
Date Fri, 09 Sep 2016 09:06:20 GMT
Jean-Baptiste Onofré created BEAM-621:
-----------------------------------------

             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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