Rust

Always add round robin repartition for child sources #832

Job	Run time
cargo check	13m 23s
build with wasm-pack	3m 7s
Check License Header	2m 26s
cargo test (win64)	13m 23s
Check cargo fmt	39s
cargo test (macos)	8m 48s
cargo test (macos-aarch64)	7m 34s
Verify MSRV (Min Supported Rust Version)	9m 6s
Verify Vendored Code	51s
cargo test datafusion-cli (amd64)	4m 32s
cargo test (amd64)	8m 11s
cargo test doc (amd64)	17m 53s
cargo examples (amd64)	14m 48s
cargo doc	4m 31s
verify benchmark results (amd64)	12m 58s
clippy	6m 59s
check Cargo.toml formatting	2m 58s
check configs.md and ***_functions.md is up-to-date	3m 52s
Run sqllogictest with Postgres runner	4m 9s
cargo test hash collisions (amd64)	7m 49s
cargo test pyarrow (amd64)	3m 14s
	2h 31m 11s

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