mapleFU opened a new issue, #44541:
URL: https://github.com/apache/arrow/issues/44541
### Describe the bug, including details regarding any error messages,
version, and platform.
The problem raised from [1]. `NumericArray<T>` uses `values_` as a cache of
typed values[2]. This might not being set when calling the
`PrimitiveArray::PrimitiveArray` constructor [3]. The code can be reproduced
like:
```c++
TEST(TestPrettyPrintArray, TimestampArray) {
auto array = std::make_shared<TimestampArray>(
timestamp(TimeUnit::MICRO),
/*length=*/1, Buffer::FromVector(std::vector<int64_t>{0}));
auto v0 = array->GetView(0);
std::cout << v0 << std::endl;
}
```
This might be fixed with:
```diff
diff --git a/cpp/src/arrow/array/array_primitive.h
b/cpp/src/arrow/array/array_primitive.h
index 3e2893b7dd..410e8516da 100644
--- a/cpp/src/arrow/array/array_primitive.h
+++ b/cpp/src/arrow/array/array_primitive.h
@@ -103,6 +103,15 @@ class NumericArray : public PrimitiveArray {
null_count, offset));
}
+ NumericArray(const std::shared_ptr<DataType>& type, int64_t length,
+ const std::shared_ptr<Buffer>& data,
+ const std::shared_ptr<Buffer>& null_bitmap = NULLPTR,
+ int64_t null_count = kUnknownNullCount, int64_t offset =
0): PrimitiveArray(type, length, data, null_bitmap, null_count, offset) {
+ values_ = raw_values_
+ ? (reinterpret_cast<const value_type*>(raw_values_) +
data_->offset)
+ : NULLPTR;
+ }
+
const value_type* raw_values() const { return values_; }
value_type Value(int64_t i) const { return values_[i]; }
```
But I don't know would I missed something.
[1] https://github.com/apache/arrow/pull/44190
[2]
https://github.com/apache/arrow/blob/a3c39ecb778188539c3ec4b6c6f2b540d8e4be40/cpp/src/arrow/array/array_primitive.h#L131
[3]
https://github.com/apache/arrow/blob/a3c39ecb778188539c3ec4b6c6f2b540d8e4be40/cpp/src/arrow/array/array_primitive.h#L122
### Component(s)
C++
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