Rust

Always add round robin repartition for child sources #835

Job	Run time
Check cargo fmt	43s
Check License Header	2m 19s
cargo check	8m 36s
build with wasm-pack	3m 9s
cargo test (macos)	6m 15s
cargo test (macos-aarch64)	5m 59s
Verify MSRV (Min Supported Rust Version)	9m 22s
Verify Vendored Code	57s
cargo test (win64)	12m 54s
cargo test (amd64)	8m 8s
cargo test datafusion-cli (amd64)	4m 39s
cargo examples (amd64)	14m 36s
clippy	7m 30s
cargo test hash collisions (amd64)	8m 16s
cargo doc	4m 50s
cargo test doc (amd64)	17m 46s
Run sqllogictest with Postgres runner	4m 9s
cargo test pyarrow (amd64)	3m 9s
verify benchmark results (amd64)	13m 24s
check Cargo.toml formatting	52s
check configs.md and ***_functions.md is up-to-date	3m 35s
	2h 21m 8s

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