mchades commented on PR #9943:
URL: https://github.com/apache/gravitino/pull/9943#issuecomment-3881982062

   Addressed review comments:
   
   1. **RuntimeType.from_string() exception type** (function_impl.py:68): 
Fixed. Now iterates over enum values and raises `ValueError` for unsupported 
runtimes, consistent with `FunctionType.from_string()` and 
`SortDirection.from_string()` patterns in the codebase.
   
   2. **SimpleFunctionParam.__hash__() missing default_value** 
(function_param.py:94): Fixed. Added `default_value` to `__hash__()` to match 
`__eq__()` and the Java `hashCode()` implementation.
   
   3. **FunctionDefinitions.of() missing return_type validation** 
(function_definition.py:161): The Java API (`FunctionDefinitions.of()`) also 
does not validate `returnType` — it trusts the caller. This is by design. Will 
review whether the Java side should also add validation separately.
   
   4. **FunctionDefinitions.of_table() missing return_columns validation** 
(function_definition.py:180): Same as above — the Java API doesn't validate 
`returnColumns` in the factory method either. Will review together with comment 
3.
   
   5. **Missing unit tests** (function_type.py:57): This PR defines pure API 
model types mirroring the Java API. Unit tests will be added when the client 
implementation that uses these models is built in a follow-up PR.
   
   6. **PR description vs implementation** (function_change.py:115): PR 
description has been corrected to accurately reflect the implemented change 
types.
   
   7. **SimpleFunctionDefinition constructor mutual exclusion** 
(function_definition.py:99): The Java `FunctionDefinitionImpl` constructor also 
does not validate mutual exclusivity of `returnType` vs `returnColumns`. The 
contract is enforced via factory methods (`of()` vs `of_table()`). Will review 
together with comments 3 and 4.


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