Rust

fix: Avoid panicing when stats are not available for a file group split #69702

Job	Run time
cargo test (macos-aarch64)	6m 11s
Verify Vendored Code	1m 33s
linux build test	7m 7s
Verify MSRV (Min Supported Rust Version)	6m 24s
Check cargo fmt	1m 26s
build and run with wasm-pack	6m 9s
cargo check datafusion-substrait features	10m 19s
cargo check datafusion-proto features	5m 13s
cargo check datafusion features	12m 32s
cargo check datafusion-common features	2m 3s
cargo test (amd64)	15m 38s
cargo test datafusion-cli (amd64)	5m 22s
cargo check datafusion-functions features	2m 25s
cargo test doc (amd64)	9m 43s
Run sqllogictest in Substrait round-trip mode	7m 26s
verify benchmark results (amd64)	14m 10s
check example README is up-to-date	5m 44s
check configs.md and ***_functions.md is up-to-date	6m 24s
cargo examples (amd64)	16m 17s
cargo doc	5m 5s
check Cargo.toml formatting	3m 14s
clippy	8m 3s
Run sqllogictest with Postgres runner	6m 16s
	2h 44m 44s

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