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https://issues.apache.org/jira/browse/BEAM-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981594#comment-15981594
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Ahmet Altay commented on BEAM-1502:
-----------------------------------
[~charleschen] is making changes to {{DirectRunner}} that affects this code
path. It is better to wait until after that work is complete to before working
on this.
> CombinePerKey returns a list of lists when run locally, but something else
> when run on Dataflow
> -----------------------------------------------------------------------------------------------
>
> Key: BEAM-1502
> URL: https://issues.apache.org/jira/browse/BEAM-1502
> Project: Beam
> Issue Type: Bug
> Components: sdk-py
> Reporter: Pablo Estrada
> Assignee: Ahmet Altay
> Fix For: First stable release
>
>
> GroupByKey also has this issue. This has been seen by customers internally
> and externally:
> http://stackoverflow.com/questions/42276520/dataflow-0-5-5-what-does-object-of-type-unwindowedvalues-has-no-len-mean/42283279#42283279
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