[GitHub] [beam] kennknowles opened a new issue, #17979: Native support for conditional iteration

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kennknowles opened a new issue, #17979:
URL: https://github.com/apache/beam/issues/17979

   Ported from: https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues/50
   
   There are a variety of use cases which would benefit from native support for conditional iteration.
   
   For instance, http://stackoverflow.com/questions/31654421/conditional-iterations-in-google-cloud-dataflow/31659923?noredirect=1#comment51264604_31659923 asks about being able to write a loop like the following:
   
   ```
   
   PCollection data  = ...
   while(needsMoreWork(data)) {
     data = doAStep(data)
   }
   
   ```
   
   If there are specific use cases please let us know the details. In the future we will use this issue to post progress updates.
   
   Imported from Jira [BEAM-106](https://issues.apache.org/jira/browse/BEAM-106). Original Jira may contain additional context.
   Reported by: lcwik.


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