ARM m1 mac installs pymilvus and reports grpcio error

grpcio

 [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  WARNING: No metadata found in /Users/bot/.local/share/virtualenvs/svddb-zjMY7Kbc/lib/python3.9/site-packages
  Rolling back uninstall of grpcio
  Moving to /Users/bot/.local/share/virtualenvs/svddb-zjMY7Kbc/lib/python3.9/site-packages/grpc/
   from /Users/bot/.local/share/virtualenvs/svddb-zjMY7Kbc/lib/python3.9/site-packages/~rpc
  Moving to /Users/bot/.local/share/virtualenvs/svddb-zjMY7Kbc/lib/python3.9/site-packages/grpcio-1.37.0.dist-info/
   from /Users/bot/.local/share/virtualenvs/svddb-zjMY7Kbc/lib/python3.9/site-packages/~rpcio-1.37.0.dist-info
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> grpcio

note: This is an issue with the package mentioned above, not pip.
hint: See above for output from the failure.

Solution:
First use brew to install openssl

 brew install openssl

Install with the following command:

 CFLAGS="-I/opt/homebrew/opt/openssl/include" LDFLAGS="-L/opt/homebrew/opt/openssl/lib" GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=1 GRPC_PYTHON_BUILD_SYSTEM_ZLIB=1 pip install pymilvus