Rust

Always add round robin repartition for leaves #831

Job	Run time
build with wasm-pack	3m 15s
cargo check	13m 46s
Check License Header	2m 18s
cargo test (macos)	12m 28s
cargo test (macos-aarch64)	13m 16s
cargo test (win64)	1h 17m 10s
Check cargo fmt	43s
Verify MSRV (Min Supported Rust Version)	9m 26s
Verify Vendored Code	50s
cargo test datafusion-cli (amd64)	4m 48s
clippy	7m 8s
cargo doc	4m 53s
cargo test (amd64)	12m 22s
cargo test hash collisions (amd64)	29m 18s
cargo test doc (amd64)	17m 51s
cargo examples (amd64)	14m 30s
Run sqllogictest with Postgres runner	4m 21s
cargo test pyarrow (amd64)	3m 0s
verify benchmark results (amd64)	14m 42s
check Cargo.toml formatting	2m 57s
check configs.md and ***_functions.md is up-to-date	3m 52s
	4h 12m 54s

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