wzx140 opened a new pull request, #27038:
URL: https://github.com/apache/flink/pull/27038
## What is the purpose of the change
The finish and reset methods in
org.apache.flink.table.runtime.arrow.writers.MapWriter should be implemented in
the same way as in org.apache.flink.table.runtime.arrow.writers.RowWriter.
Otherwise, the following sequence will lead to incorrect behavior:
```
MapWriter.write
// Arrow data is right
MapWriter.finish
MapWriter.reset
MapWriter.write
// Arrow data is wrong, map is null
MapWriter.finish
```
## Brief change log
Add finish/reset for keyWriter/valueWriter in ArrowMapWriter.
## Verifying this change
Add UT
## 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)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not documented)
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