lidavidm commented on PR #36517:
URL: https://github.com/apache/arrow/pull/36517#issuecomment-1640875150
It's not clear whether it owns the thread always, I just noticed this:
```
frame #3: 0x000000010f6733e4
libgpr.33.0.0.dylib`grpc_core::Crash(std::__1::basic_string_view<char,
std::__1::char_traits<char> >, grpc_core::SourceLocation) + 186
frame #4: 0x000000010f6746e6 libgpr.33.0.0.dylib`grpc_core::(anonymous
namespace)::ThreadInternalsPosix::Join() + 138
frame #5: 0x000000011046299c
libgrpc++.1.56.2.dylib`grpc_core::Thread::Join() + 24
frame #6: 0x0000000110444ee0
libgrpc++.1.56.2.dylib`grpc::CompletionQueue::ReleaseCallbackAlternativeCQ(grpc::CompletionQueue*)
+ 84
frame #7: 0x000000011043c746
libgrpc++.1.56.2.dylib`grpc::Channel::~Channel() + 58
frame #8: 0x000000011043ebc9
libgrpc++.1.56.2.dylib`std::__1::__shared_ptr_pointer<grpc::Channel*,
std::__1::shared_ptr<grpc::Channel>::__shared_ptr_default_delete<grpc::Channel,
grpc::Channel>, std::__1::allocator<grpc::Channel> >::__on_zero_shared() + 23
frame #9: 0x000000011043ef21
libgrpc++.1.56.2.dylib`std::__1::shared_ptr<grpc::ChannelCredentials>::~shared_ptr()
+ 49
frame #10: 0x0000000111ea89c5
libarrow_flight.1300.0.0.dylib`::~ClientRpc() at grpc_client.cc:69:8
```
so destructing the ClientContext (at least, I assume it's there -
`ClientRpc` is our wrapper around it) appears to call Join() (but only on
macOS?).
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