Mryange opened a new pull request, #61941:
URL: https://github.com/apache/doris/pull/61941
### What problem does this PR solve?
`TYPE_LAMBDA_FUNCTION` (enum value 33) is not a real column data type — it
is a semantic tag for lambda expressions. Lambda execution is entirely driven
by `TExprNodeType::LAMBDA_FUNCTION_EXPR`, not `PrimitiveType`. Having it in the
`PrimitiveType` enum pollutes the enum semantics and causes a structural
inconsistency in `VLambdaFunctionExpr._data_type`.
### Changes
1. **Mark `TYPE_LAMBDA_FUNCTION` as `[[deprecated]]`** in
`define_primitive_type.h` (enum value 33 is preserved for ABI compatibility).
2. **`from_thrift()`**: Map `TPrimitiveType::LAMBDA_FUNCTION` →
`TYPE_STRING` instead of `TYPE_LAMBDA_FUNCTION`. This is semantically
equivalent since `DataTypeFactory` always created `DataTypeString` for it
anyway. Thrift protocol compatibility is maintained (old FE → new BE still
works).
3. **Remove all BE references** to `TYPE_LAMBDA_FUNCTION`:
- `to_thrift()` / `type_to_string()` — removed switch cases (all have
`default:` branches)
- `data_type_factory.cpp` — removed case (falls through to `default:`)
- `data_type_decimal.cpp` — removed dead code branch (unreachable since
`create_data_type(TYPE_LAMBDA_FUNCTION)` returns `DataTypeString` whose
`get_primitive_type()` is `TYPE_STRING`)
- `tablet_schema.cpp` — removed case (identical to `default:` behavior)
- `cast_test.h` — removed case (identical to `default:` behavior)
4. **Fix `VLambdaFunctionExpr._data_type` inconsistency**: In `prepare()`,
override `_data_type` with `get_child(0)->data_type()` (the lambda body's
actual return type) instead of keeping the placeholder `DataTypeString`.
### Release note
None
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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