Rust

Improve comments #1705

Job	Run time
build with wasm-pack	3m 35s
linux build test	4m 36s
Check cargo fmt	44s
Check License Header	2m 15s
cargo test (macos-aarch64)	14m 52s
Verify MSRV (Min Supported Rust Version)	10m 43s
Verify Vendored Code	50s
check configs.md and ***_functions.md is up-to-date	4m 33s
cargo check datafusion	5m 31s
clippy	8m 4s
check Cargo.toml formatting	3m 14s
cargo check functions	2m 14s
cargo check no default features	10m 43s
cargo doc	5m 57s
cargo test (amd64)	13m 36s
cargo test datafusion-cli (amd64)	5m 21s
cargo test doc (amd64)	19m 16s
cargo examples (amd64)	16m 17s
Run sqllogictest with Postgres runner	5m 20s
cargo test pyarrow (amd64)	3m 26s
verify benchmark results (amd64)	9m 6s
	2h 30m 13s

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