Rust

Use Arc::unwrap_or_clone #143

Job	Run time
build with wasm-pack	2m 36s
Check cargo fmt	34s
cargo test (macos-aarch64)	11m 52s
cargo check	7m 34s
cargo test (macos)	10m 4s
Verify Vendored Code	56s
cargo test (win64)	45m 27s
Verify MSRV (Min Supported Rust Version)	6m 50s
cargo examples (amd64)	13m 27s
cargo test (amd64)	10m 21s
cargo test datafusion-cli (amd64)	4m 3s
cargo doc	3m 56s
cargo test doc (amd64)	14m 28s
Run sqllogictest with Postgres runner	3m 34s
verify benchmark results (amd64)	12m 7s
check Cargo.toml formatting	3m 3s
clippy	5m 42s
check configs.md is up-to-date	2m 43s
cargo test hash collisions (amd64)	14m 15s
cargo test pyarrow (amd64)	3m 2s
	2h 56m 34s

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