optimize code #347

Job	Run time
cargo check	5m 51s
build with wasm-pack	2m 16s
Check cargo fmt	27s
cargo test (macos)	10m 34s
cargo test (macos-aarch64)	9m 24s
Verify MSRV (Min Supported Rust Version)	6m 44s
Verify Vendored Code	57s
cargo test (win64)	41m 56s
check configs.md is up-to-date	3m 18s
check Cargo.toml formatting	2m 41s
clippy	5m 40s
cargo test hash collisions (amd64)	14m 17s
cargo test (amd64)	10m 10s
cargo doc	4m 8s
cargo test datafusion-cli (amd64)	4m 20s
cargo test doc (amd64)	14m 21s
cargo examples (amd64)	14m 24s
Run sqllogictest with Postgres runner	3m 35s
cargo test pyarrow (amd64)	2m 59s
verify benchmark results (amd64)	12m 9s
	2h 50m 11s

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