SteNicholas opened a new pull request #12078:
URL: https://github.com/apache/flink/pull/12078
## What is the purpose of the change
*There are different behaviors of result of internal map state. For
`HeapMapState`, #entries(), #keys(), #values(), and #iterator() would all
return null. However, for `RocksDBMapState`, #entries() would return null,
while #keys(), #values(), #iterator() would return empty iterator.
UserFacingMapState would align behaviors to empty iterator instead of null.*
## Brief change log
- *Modify result of `HeapMapState` #entries(), #keys(), #values(), and
#iterator() method to empty iterator.*
- *Modify result of `RocksDBMapState` #entries() method to empty iterator.*
## Verifying this change
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / no)
- The serializers: (yes / no / don't know)
- The runtime per-record code paths (performance sensitive): (yes / no /
don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't
know)
- The S3 file system connector: (yes / no / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / no)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs
/ not documented)
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