mapleFU commented on PR #37641:
URL: https://github.com/apache/arrow/pull/37641#issuecomment-1735522173
```c++
if (buffer[i].len == 0) {
// If the buffer length is zero, the memcpy to data_ptr can be
ignored.
buffer[i].ptr = reinterpret_cast<const uint8_t*>(prefix.data());
buffer[i].len = prefix_len_ptr[i];
} else if (prefix_len_ptr[i] != 0) {
// If the prefix length is zero, the prefix can be ignored.
memcpy(data_ptr, prefix.data(), prefix_len_ptr[i]);
// buffer[i] currently points to the string suffix
memcpy(data_ptr + prefix_len_ptr[i], buffer[i].ptr, buffer[i].len);
buffer[i].ptr = data_ptr;
buffer[i].len += prefix_len_ptr[i];
data_ptr += buffer[i].len;
}
prefix = std::string_view{buffer[i]};
```
I tent to use code like this, but let me leave it to later patch with more
carefully design...
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