Rust

refactor: make explicit what is an invariant of the logical plan, ver… #488

Job	Run time
cargo check	1m 20s
build with wasm-pack	1m 51s
Check License Header	2m 16s
cargo test (macos)	2m 13s
cargo test (win64)	5m 56s
Check cargo fmt	37s
cargo test (macos-aarch64)	2m 11s
Verify MSRV (Min Supported Rust Version)	5m 58s
Verify Vendored Code	48s
clippy	0s
check Cargo.toml formatting	0s
check configs.md and ***_functions.md is up-to-date	0s
cargo test hash collisions (amd64)	0s
cargo doc	0s
cargo test (amd64)	0s
cargo test doc (amd64)	0s
cargo test datafusion-cli (amd64)	0s
cargo examples (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
	23m 10s

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