zhipeng93 opened a new pull request, #215:
URL: https://github.com/apache/flink-ml/pull/215
## What is the purpose of the change
Currently BroadcastUtils::withBroadcastStream does not support
DataStream::cogroup/join, since we restricted that users can only introduce one
extra operator in the specified lambda function.
To support using join/cogroup in BroadcastUtils::withBroadcastStream, we
would like to relax the restriction such that users can introduce more than
more extra operator, but only the output operator can access the broadcast
variables.
## Brief change log
- Relaxes the restrictions of BroadcastUtils::withBroadcastStream such that
users can introduce more than one operator in the specified lambda function.
- Sets keyContext to deal with the case that the non-broadcast input is a
keyed stream.
- Adds unit test to verify the change.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (JavaDocs)
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