Accepting clippy good suggestions #14

Job	Run time
Check cargo fmt	38s
cargo check	3m 28s
build with wasm-pack	2m 6s
cargo test (macos)	33m 26s
cargo test (macos-aarch64)	9m 29s
Verify MSRV (Min Supported Rust Version)	6m 37s
Verify Vendored Code	1m 3s
cargo test (win64)	40m 51s
cargo test (amd64)	10m 30s
cargo examples (amd64)	2m 56s
cargo test doc (amd64)	11m 46s
cargo doc	3m 41s
Run sqllogictest with Postgres runner	3m 15s
cargo test datafusion-cli (amd64)	3m 33s
verify benchmark results (amd64)	12m 2s
check Cargo.toml formatting	3m 5s
clippy	5m 0s
check configs.md is up-to-date	16m 9s
cargo test hash collisions (amd64)	10m 20s
cargo test pyarrow (amd64)	2m 34s
	3h 2m 29s

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