Rust

Apply suggestions from code review #4192

Job	Run time
cargo check	7m 59s
Check License Header	2m 7s
build with wasm-pack	3m 16s
Check cargo fmt	1m 3s
cargo test (macos)	11m 40s
cargo test (macos-aarch64)	15m 45s
Verify MSRV (Min Supported Rust Version)	8m 59s
Verify Vendored Code	48s
cargo test (amd64)	12m 25s
check Cargo.toml formatting	2m 51s
clippy	6m 52s
check configs.md and ***_functions.md is up-to-date	3m 29s
cargo doc	4m 34s
cargo test datafusion-cli (amd64)	4m 57s
cargo test doc (amd64)	17m 49s
cargo examples (amd64)	14m 56s
Run sqllogictest with Postgres runner	4m 17s
cargo test pyarrow (amd64)	3m 6s
verify benchmark results (amd64)	14m 43s
cargo test hash collisions (amd64)	29m 5s
	2h 50m 41s

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