robertwb commented on pull request #12226: URL: https://github.com/apache/beam/pull/12226#issuecomment-656958029
> Alternatively, flattens with no inputs could be roots? I actually thought about this, but figured this way is more future-proof in case there are any other corner cases like this that come up (especially as the symptoms are non-obvious). This also preserves existing behavior (e.g. start/finishBundle are never invoked for this empty PCollection, though wether that's OK by the model is an ambiguity best left to the list). ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
