snuyanzin opened a new pull request, #27794:
URL: https://github.com/apache/flink/pull/27794
## What is the purpose of the change
The problem is that
if there is existing materialized table {{mt}} with schema
```
`a` BIGINT NOT NULL, `b` STRING, `c` INT, `d` STRING
```
and then we use {{CREATE OR ALTER}} like
```sql
CREATE OR ALTER MATERIALIZED TABLE base_mtbl (
`a` BIGINT NOT NULL, `b` STRING, `c` INT, `d` STRING, `a1` BIGINT NOT NULL)
AS SELECT a, b, c, d, a as `a1` FROM t3
```
then it will update existing schema adding `a1 BIGINT NOT`, i.e. it omits
nullability.
It would make sense if there is no explicit schema mentioned
however in case of schema is present it should respect it
## Brief change log
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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