fenfeng9 opened a new pull request, #48982:
URL: https://github.com/apache/arrow/pull/48982
### Rationale for this change
`FileReader::ReadRowGroup(s)` previously returned `Status` and required
callers to pass an `out` parameter.
### What changes are included in this PR?
Introduce `Result<std::shared_ptr<Table>>` returning APIs to allow clearer
error propagation:
- Add new Result-returning `ReadRowGroup()` / `ReadRowGroups()` methods
- Deprecate the old Status/out-parameter overloads
- Update C++ callers and R/Python/GLib bindings to use the new API
### Are these changes tested?
Yes.
### Are there any user-facing changes?
Yes.
Status versions of FileReader::ReadRowGroup(s) have been deprecated.
```cpp
virtual ::arrow::Status ReadRowGroup(int i, const std::vector<int>&
column_indices,
std::shared_ptr<::arrow::Table>* out);
virtual ::arrow::Status ReadRowGroup(int i, std::shared_ptr<::arrow::Table>*
out);
virtual ::arrow::Status ReadRowGroups(const std::vector<int>& row_groups,
const std::vector<int>& column_indices,
std::shared_ptr<::arrow::Table>* out);
virtual ::arrow::Status ReadRowGroups(const std::vector<int>& row_groups,
std::shared_ptr<::arrow::Table>* out);
```
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