[FLINK-35813] Transform schema operator failed to trigger checkpoint with bounded source

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: cdc-3.1.1
• Fix Version/s: cdc-3.2.0
• Component/s: Flink CDC
• Labels: pull-request-available
• Assignee: yux
• Reporter: yux
• Created: 11/Jul/24 08:29
• Updated: 06/Aug/24 09:49
• Resolved: 06/Aug/24 09:49

Description

Currently, transform schema operator clears its state field after a bounded job finishes. Any following checkpoint requests in snapshotState method will cause an NPE. Here's a minimum reproducible example:

```
source:
type: values
sink:
type: values
transform:
...
```

Issue Links

• links to: GitHub Pull Request #3469