Rust

perf: Optimize `to_char` to allocate less, fix NULL handling (#20635) #1

Job	Run time
Verify MSRV (Min Supported Rust Version)	5m 11s
cargo test (macos-aarch64)	18m 37s
linux build test	7m 5s
Verify Vendored Code	1m 38s
Check cargo fmt	1m 11s
build and run with wasm-pack	5m 18s
Run sqllogictest with Postgres runner	7m 16s
cargo check datafusion-proto features	5m 5s
cargo check datafusion-substrait features	10m 10s
cargo check datafusion features	11m 25s
cargo check datafusion-functions features	3m 17s
cargo test (amd64)	14m 41s
cargo check datafusion-common features	2m 15s
cargo examples (amd64)	16m 26s
cargo doc	5m 5s
cargo test doc (amd64)	8m 10s
check configs.md and ***_functions.md is up-to-date	5m 26s
check example README is up-to-date	4m 36s
verify benchmark results (amd64)	12m 18s
cargo test datafusion-cli (amd64)	4m 23s
clippy	7m 10s
check Cargo.toml formatting	3m 28s
Run sqllogictest in Substrait round-trip mode	9m 9s
	2h 49m 20s

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