Apply suggestions from code review #2448

Job	Run time
cargo check	1m 35s
build with wasm-pack	1m 59s
Check cargo fmt	37s
cargo test (mac)	5m 26s
Verify MSRV	4m 5s
Verify Vendored Code	1m 2s
cargo test (win64)	5m 43s
cargo examples (amd64)	0s
cargo doc	0s
cargo test datafusion-cli (amd64)	0s
cargo test doc (amd64)	0s
cargo test (amd64)	0s
check Cargo.toml formatting	0s
clippy	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
check configs.md is up-to-date	0s
cargo test hash collisions (amd64)	0s
	20m 27s

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