Rust

fix: Avoid panicing when stats are not available for a file group spl… #667

Job	Run time
linux build test	7m 1s
build and run with wasm-pack	5m 55s
cargo test (macos-aarch64)	7m 41s
Verify MSRV (Min Supported Rust Version)	5m 44s
Check cargo fmt	1m 14s
Verify Vendored Code	1m 25s
cargo check datafusion-proto features	4m 30s
cargo test (amd64)	15m 1s
cargo check datafusion-common features	2m 0s
verify benchmark results (amd64)	13m 54s
cargo examples (amd64)	15m 35s
cargo check datafusion features	11m 56s
check Cargo.toml formatting	3m 4s
cargo check datafusion-substrait features	12m 18s
cargo test datafusion-cli (amd64)	5m 19s
cargo check datafusion-functions features	3m 6s
Run sqllogictest with Postgres runner	6m 13s
cargo test doc (amd64)	8m 49s
Run sqllogictest in Substrait round-trip mode	5m 39s
check configs.md and ***_functions.md is up-to-date	6m 30s
cargo doc	5m 20s
check example README is up-to-date	5m 24s
clippy	7m 32s
	2h 41m 10s

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