Ray shuffle not working  #10

I got an error on Mac: Memory pointer from external source (e.g, FFI) is not aligned with the specified scalar type. Before importing buffer through FFI, please make sure the allocation is aligned. while using ray shuffle on Datafusion Ray against TPC-H.

After that the Ray worker died.

@andygrove saw this error when trying to run the example on Linux, but it worked on Mac.

@franklsf95 Any suggestion would be helpful! I appreciate it!