Rust

fix(proto): honor ExecutionPlan downcast_delegate during serialization #637

Job	Run time
cargo test (macos-aarch64)	7m 41s
Verify Vendored Code	1m 25s
linux build test	7m 19s
build and run with wasm-pack	6m 15s
Verify MSRV (Min Supported Rust Version)	5m 2s
Check cargo fmt	1m 15s
cargo check datafusion features	11m 47s
cargo check datafusion-substrait features	11m 29s
cargo test (amd64)	14m 2s
check example README is up-to-date	5m 28s
cargo examples (amd64)	15m 15s
cargo check datafusion-common features	1m 52s
cargo check datafusion-proto features	4m 44s
clippy	7m 30s
check Cargo.toml formatting	3m 47s
check configs.md and ***_functions.md is up-to-date	5m 31s
cargo check datafusion-functions features	2m 41s
verify benchmark results (amd64)	13m 19s
cargo test doc (amd64)	9m 34s
cargo test datafusion-cli (amd64)	5m 31s
cargo doc	5m 48s
Run sqllogictest with Postgres runner	7m 4s
Run sqllogictest in Substrait round-trip mode	7m 10s
	2h 41m 29s

Provide feedback