optimize code #15

Job	Run time
Check cargo fmt	52s
build with wasm-pack	2m 25s
cargo check	6m 19s
cargo test (macos)	12m 35s
Verify MSRV (Min Supported Rust Version)	6m 57s
Verify Vendored Code	59s
cargo test (win64)	23m 41s
check Cargo.toml formatting	1m 10s
cargo test hash collisions (amd64)	8m 10s
check configs.md is up-to-date	2m 40s
clippy	4m 58s
cargo doc	3m 44s
cargo test (amd64)	8m 38s
cargo test datafusion-cli (amd64)	3m 36s
cargo test doc (amd64)	10m 55s
cargo examples (amd64)	8m 14s
Run sqllogictest with Postgres runner	3m 41s
cargo test pyarrow (amd64)	2m 30s
verify benchmark results (amd64)	10m 7s
	2h 2m 11s

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