Rust

Add comments to physical optimizer tests #4289

Job	Run time
Check License Header	2m 23s
linux build test	4m 6s
Check cargo fmt	48s
build with wasm-pack	3m 29s
Verify MSRV (Min Supported Rust Version)	10m 11s
cargo test (macos-aarch64)	15m 13s
Verify Vendored Code	49s
cargo check functions	1m 41s
cargo test (amd64)	13m 23s
cargo check datafusion	5m 17s
cargo doc	4m 46s
cargo check no default features	8m 33s
cargo test datafusion-cli (amd64)	5m 6s
cargo test doc (amd64)	18m 12s
cargo examples (amd64)	15m 14s
verify benchmark results (amd64)	8m 51s
check Cargo.toml formatting	3m 8s
clippy	6m 42s
check configs.md and ***_functions.md is up-to-date	4m 3s
Run sqllogictest with Postgres runner	4m 54s
cargo test pyarrow (amd64)	3m 25s
	2h 20m 14s

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