snuyanzin opened a new pull request, #27807:
URL: https://github.com/apache/flink/pull/27807
## What is the purpose of the change
A number of cases like
```sql
CREATE MATERIALIZED TABLE mt1 (
id INT, t TIMESTAMP_LTZ(3)
)
AS SELECT 1 as id, current_timestamp as t
```
and then
```sql
CREATE OR ALTER MATERIALIZED TABLE mt1 (
id INT, t TIMESTAMP_LTZ(3),
WATERMARK FOR t as current_timestamp - INTERVAL '5' SECOND
)
AS SELECT 1 as id, current_timestamp as t
```
it will ignore watermark (all cases like create/modify/drop)
same for constraint
also similar issue for column comments
## Brief change log
converter and tests
## Verifying this change
new tests introduced
## 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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