mapleFU opened a new issue, #45431:
URL: https://github.com/apache/arrow/issues/45431
### Describe the enhancement requested
Describe the enhancement requested
```c++
random::RandomArrayGenerator gen(/*seed=*/42);
auto test_identity_cast_for_type =
[&gen](const std::shared_ptr<arrow::DataType>& data_type) {
auto tmp_array = gen.ArrayOf(data_type, /*size=*/1,
/*null_probability=*/0.0);
ARROW_SCOPED_TRACE("data type = ", data_type->ToString());
ASSERT_OK_AND_ASSIGN(auto scalar, tmp_array->GetScalar(0));
ASSERT_OK_AND_ASSIGN(auto casted_scalar, scalar->CastTo(data_type));
ASSERT_TRUE(casted_scalar->Equals(*scalar));
ASSERT_TRUE(scalar->Equals(*casted_scalar));
};
for (auto& complex_type: {
arrow::map(arrow::binary(), arrow::int32()),
struct_({field("float", arrow::float32())}),
}) {
test_identity_cast_for_type(complex_typee);
}
```
This would report an error when casting the type to the same type.
This might not a problem since it would likely to be deprecated
https://github.com/apache/arrow/issues/39182 , and Cast works well in this
scenerio.
### Component(s)
C++
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