yux created FLINK-35256:
---------------------------
Summary: Pipeline transform ignores column type nullability
Key: FLINK-35256
URL: https://issues.apache.org/jira/browse/FLINK-35256
Project: Flink
Issue Type: Improvement
Components: Flink CDC
Reporter: yux
Attachments: log.txt
Flink CDC 3.1.0 brought transform feature, allowing column type / value
transformation prior to data routing process. However after the transformation,
column type marked as `NOT NULL` lost their annotation, causing some downstream
sinks to fail since they require primary key to be NOT NULL.
Here's the minimum reproducible example about this problem:
```yaml
source:
type: mysql
...
sink:
type: starrocks
name: StarRocks Sink
...
pipeline:
name: Sync MySQL Database to StarRocks
parallelism: 4
transform:
- source-table: reicigo.\.*
projection: ID, UPPER(ID) AS UPID
```
In the MySQL source table, primary key column `ID` is marked as `NOT NULL`, but
such information was lost at downstream, causing the following exception (see
attachment).
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