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55777812d4
When streaming files using multipart upload, switch from using `output_stream::write(const char*, size_t)` to passing buffer objects directly to `output_stream::write()`. This eliminates unnecessary memory copying that occurred when the original implementation had to defensively copy data before sending. The buffer objects can now be safely reused by the output stream instead of creating deep copies, which should improve performance by reducing memory operations during S3 file uploads. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#23567