Rust

Cherry pick b5022000c - fix: make PushDownLeafProjections work with unnest #623

Job	Run time
cargo test (macos-aarch64)	10m 1s
Verify Vendored Code	1m 27s
Check cargo fmt	1m 7s
Verify MSRV (Min Supported Rust Version)	6m 6s
build and run with wasm-pack	6m 27s
linux build test	7m 8s
cargo check datafusion-substrait features	12m 41s
cargo test (amd64)	16m 44s
cargo check datafusion features	13m 26s
cargo check datafusion-functions features	2m 53s
cargo check datafusion-common features	2m 6s
Run sqllogictest in Substrait round-trip mode	7m 31s
Run sqllogictest with Postgres runner	6m 51s
cargo test datafusion-cli (amd64)	5m 22s
check configs.md and ***_functions.md is up-to-date	6m 0s
clippy	7m 10s
verify benchmark results (amd64)	12m 50s
cargo examples (amd64)	16m 27s
check example README is up-to-date	6m 31s
cargo check datafusion-proto features	4m 49s
cargo doc	5m 42s
cargo test doc (amd64)	9m 38s
check Cargo.toml formatting	4m 46s
	2h 53m 43s

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