Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2575
I originally meant it to be the "id" or something like that.
The confusion probably comes because "B" occurs multiple times. That is a
copy and paste error, it should be a new letter.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
