Rust

test: demonstrate yielding btwn each open file being scanned #561

Job	Run time
Check License Header	2m 22s
linux build test	3m 41s
Check cargo fmt	39s
build with wasm-pack	3m 34s
cargo test (macos-aarch64)	31m 30s
Verify MSRV (Min Supported Rust Version)	9m 37s
Verify Vendored Code	54s
cargo check datafusion	4m 46s
clippy	7m 44s
check Cargo.toml formatting	3m 28s
check configs.md and ***_functions.md is up-to-date	4m 12s
cargo check functions	1m 36s
cargo check no default features	8m 35s
cargo doc	4m 40s
cargo test (amd64)	12m 33s
cargo test datafusion-cli (amd64)	5m 4s
cargo test doc (amd64)	18m 24s
cargo examples (amd64)	15m 30s
Run sqllogictest with Postgres runner	4m 49s
verify benchmark results (amd64)	8m 33s
cargo test pyarrow (amd64)	3m 32s
	2h 35m 43s

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