snuyanzin opened a new pull request, #27327:
URL: https://github.com/apache/flink/pull/27327
## What is the purpose of the change
The next part of FLIP-550 which adds support for `ALTER MATERIALIZED TABLE
MODIFY` in way like
```sql
ALTER MATERIALIZED TABLE myMaterializedTable MODIFY c1 AS current_timestamp
COMMENT 'new_column docs';
```
and
```sql
ALTER MATERIALIZED TABLE myMaterializedTable MODIFY (
ts AS current_timestamp FIRST,
col_meta INT METADATA FROM 'mk1' VIRTUAL AFTER col_b,
PRIMARY KEY (id) NOT ENFORCED,
WATERMARK FOR ts AS ts - INTERVAL '3' SECOND
);
```
## Brief change log
parser and converters
## Verifying this change
parser and converter's test 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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