huberylee opened a new issue, #45586:
URL: https://github.com/apache/arrow/issues/45586
### Describe the bug, including details regarding any error messages,
version, and platform.
```C++
/// cpp/src/arrow/array/builder_nested.h:774~792
/// \brief Append a null value. Automatically appends an empty value to
each child
/// builder.
Status AppendNull() final {
for (const auto& field : children_) {
ARROW_RETURN_NOT_OK(field->AppendEmptyValue());
}
return Append(false);
}
/// \brief Append multiple null values. Automatically appends empty values
to each
/// child builder.
Status AppendNulls(int64_t length) final {
for (const auto& field : children_) {
ARROW_RETURN_NOT_OK(field->AppendEmptyValues(length));
}
ARROW_RETURN_NOT_OK(Reserve(length));
UnsafeAppendToBitmap(length, false);
return Status::OK();
}
```
If data is written in this way, the `null_count` in the child array will be
inconsistent when read back.
### Component(s)
C++
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