Rust

Adding comments - Review Part 3 #99

Job	Run time
build with wasm-pack	2m 22s
cargo check	3m 19s
Check cargo fmt	42s
cargo test (macos)	21m 5s
Verify MSRV (Min Supported Rust Version)	7m 10s
cargo test (macos-aarch64)	15m 48s
Verify Vendored Code	58s
cargo test (win64)	55m 2s
check Cargo.toml formatting	3m 4s
check configs.md is up-to-date	2m 17s
clippy	5m 54s
cargo test hash collisions (amd64)	11m 43s
cargo doc	3m 59s
cargo test (amd64)	12m 29s
cargo test datafusion-cli (amd64)	3m 33s
cargo test doc (amd64)	13m 3s
cargo examples (amd64)	9m 13s
Run sqllogictest with Postgres runner	3m 16s
cargo test pyarrow (amd64)	2m 31s
verify benchmark results (amd64)	10m 14s
	3h 7m 42s

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