andishgar commented on issue #49740:
URL: https://github.com/apache/arrow/issues/49740#issuecomment-4699028395
@pitrou
This is the minimum C++ code to produce the error:
```c++
TEST(CdataInterface, BinaryView) {
arrow::BinaryViewBuilder builder;
ASSERT_OK(builder.Append("1"));
ASSERT_OK_AND_ASSIGN(auto array_0, builder.Finish());
array_0->data()->buffers.push_back(nullptr);
struct ArrowArray array_out;
struct ArrowSchema schema_out;
ASSERT_OK(arrow::ExportArray(*array_0, &array_out, &schema_out));
}
```
The root of the problem is the line below, which assumes all data buffers of
BinaryView are non‑null:
https://github.com/apache/arrow/blob/e8b7b4e35e231a0fcdbfa74f6a6b0075108dd5dc/cpp/src/arrow/c/bridge.cc#L611
I have a question: as far as I have read the specification, it does not
mention whether the data buffer of BinaryViewType can be null or not. Is there
any clarification for that in the Arrow specification? (If the data buffer can
be null, the solution for this issue is only one line of code.)
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