Rust

Prevent take_optimizable from discarding arbitrary plan node #278

Job	Run time
cargo check	11m 4s
cargo test (win64)	29m 25s
Check cargo fmt	44s
build with wasm-pack	2m 47s
cargo test (macos-aarch64)	6m 58s
cargo test (macos)	7m 0s
Verify MSRV (Min Supported Rust Version)	8m 44s
Verify Vendored Code	53s
cargo test (amd64)	10m 15s
cargo doc	4m 4s
cargo test datafusion-cli (amd64)	4m 5s
clippy	6m 10s
cargo test doc (amd64)	15m 16s
Run sqllogictest with Postgres runner	3m 44s
cargo examples (amd64)	14m 1s
cargo test pyarrow (amd64)	3m 10s
verify benchmark results (amd64)	12m 40s
check Cargo.toml formatting	2m 56s
cargo test hash collisions (amd64)	17m 3s
check configs.md and ***_functions.md is up-to-date	3m 11s
	2h 44m 10s

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