dawidwys opened a new pull request #12909: URL: https://github.com/apache/flink/pull/12909
## What is the purpose of the change Make the CAST preserve nullability when converting from Expression to RexCall. This has been done in master branch as part of https://issues.apache.org/jira/browse/FLINK-13784. This PR adds a test case and backports the changes from master. ## Verifying this change * Added test `org.apache.flink.table.planner.runtime.stream.table.ValuesITCase#testNullabilityOverwriting` ## 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) ---------------------------------------------------------------- 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: us...@infra.apache.org
