snuyanzin opened a new pull request, #27854:
URL: https://github.com/apache/flink/pull/27854
## What is the purpose of the change
Seems to be an issue of `CREATE OR ALTER MATERIALIZED TABLE`, the detailed
case is described in jira
## Brief change log
do not look into constraint and watermark changes if there is no
schema/constraint definition
## Verifying this change
Tests are added
## 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 applicable)
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