Hello, I have a RecordBatch that I read from an IPC file. I need to run a cumulative sum on one of the int64 arrays in the batch. I tried to do:
std::shared_ptr<arrow::ArrayData> pos_data = batch->column_data(nAtts); auto pos_values = pos_data->GetMutableValues<int64_t>(1); for (auto i = 1; i < pos_data->length; i++) pos_values[i] += pos_values[i - 1]; but GetMutableValues returns NULL. If I use GetValue, it works fine, but I can't run the cumulative sum on the returned pointer since it is read-only. I tried creating a copy of ArryaData like so: std::shared_ptr<arrow::ArrayData> pos_data = batch->column_data(nAtts)->Copy(); but it did not help. All this data is in CPU buffers so I'm not sure what is the problem. What is the best way to mutate or copy & mutate it? Thanks! Rares
