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https://issues.apache.org/jira/browse/BEAM-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892895#comment-15892895
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Ahmet Altay commented on BEAM-1502:
-----------------------------------
DirectRunner should wrap results in container similar to other runners. These
results would not necessarily fit in memory and representing as a list is
misleading.
> 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
>
> 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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