fmt & clippy warns fixed #611

Job	Run time
cargo test (win64)	31m 17s
cargo test (mac)	11m 8s
build with wasm-pack	1m 48s
Verify MSRV	11m 45s
cargo check	3m 39s
Check cargo fmt	49s
Verify Vendored Code	46s
Run sqllogictest with Postgres runner	5m 28s
cargo doc	2m 57s
clippy	4m 38s
check Cargo.toml formatting	1m 20s
cargo test hash collisions (amd64)	8m 44s
check configs.md is up-to-date	2m 19s
cargo test (amd64)	13m 31s
cargo test datafusion-cli (amd64)	4m 42s
cargo test doc (amd64)	14m 49s
cargo examples (amd64)	4m 37s
cargo test pyarrow (amd64)	1m 58s
verify benchmark results (amd64)	9m 47s
	2h 16m 2s

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