yux created FLINK-36093:
---------------------------
Summary: PreTransform operator wrongly filters out columns when
multiple transform rules were defined
Key: FLINK-36093
URL: https://issues.apache.org/jira/browse/FLINK-36093
Project: Flink
Issue Type: Improvement
Components: Flink CDC
Reporter: yux
Currently, such transform rule could not work:
```yaml
transform:
- projection: 'A' as result
filter: tag >= 0
- projection: score as result
filter: tag < 0
```
Here, `score` column will be filtered out in PreTransform stage, since it
wasn't referenced in the first transform rule. As a result, the following
transform rule will fail since `score` does not exist in PostTransform operator.
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