haruki-830 opened a new pull request, #4482:
URL: https://github.com/apache/flink-cdc/pull/4482
#### Summary
This commit introduces statement-level code generation for Flink CDC YAML
Transform expressions. Transform expressions are now represented by a
`GeneratedExpression` intermediate structure and compiled through Janino
`ScriptEvaluator`, allowing nullable `AND` / `OR` short-circuit logic to be
generated as explicit `if` / `else` statements instead of per-record `Supplier`
wrappers.
#### Key Changes
1. Introduce Statement-Level Transform Codegen
- Added `GeneratedExpression` to carry generated statements, result term,
and result Java type.
- Added `TransformExpressionEvaluator` as a small wrapper around Janino
`ScriptEvaluator`.
- Updated projection and filter processors to compile and evaluate generated
scripts.
2. Support Statement-Level Nullable AND / OR
- Added `translateSqlNodeToGeneratedExpression(...)` in `JaninoCompiler`.
- Generates explicit short-circuit `if` / `else` blocks for nullable `AND`
and `OR`.
- Ensures the right operand is evaluated only when required.
3. Refine Nullability Handling
- Added Calcite / RelNode nullability lookup for transform sub-expressions.
- Uses RelNode nullability only to refine the existing conservative
fallback, avoiding broader semantic changes in this PR.
4. Test Coverage
- Added coverage for nullable `AND` / `OR` SQL three-valued logic.
- Added short-circuit tests for:
- `false AND (1 / 0 > 0)`
- `true OR (1 / 0 > 0)`
- Added projection and filter coverage.
- Added assertions that generated code no longer contains `new Supplier`.
#### JIRA Reference
[https://issues.apache.org/jira/browse/FLINK-40204](url)
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