Rust

Cherry pick 7b1bffa - fix: Avoid panicing when stats are not available for a file group spl… #668

Job	Run time
Verify MSRV (Min Supported Rust Version)	5m 56s
cargo test (macos-aarch64)	6m 39s
build and run with wasm-pack	6m 9s
Check cargo fmt	1m 3s
Verify Vendored Code	1m 28s
linux build test	6m 59s
cargo check datafusion-substrait features	12m 15s
cargo check datafusion features	11m 5s
cargo test (amd64)	14m 29s
cargo check datafusion-functions features	2m 45s
cargo check datafusion-common features	2m 4s
cargo check datafusion-proto features	4m 55s
check configs.md and ***_functions.md is up-to-date	6m 20s
cargo examples (amd64)	16m 4s
clippy	5m 55s
cargo doc	5m 32s
check example README is up-to-date	5m 40s
verify benchmark results (amd64)	14m 9s
cargo test datafusion-cli (amd64)	5m 35s
cargo test doc (amd64)	9m 4s
Run sqllogictest with Postgres runner	6m 50s
Run sqllogictest in Substrait round-trip mode	6m 54s
check Cargo.toml formatting	3m 29s
	2h 41m 19s

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