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++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org