Rust

Reveal implementing type and return type in simple UDF implementations #431

Job	Run time
cargo check	13m 41s
Check License Header	2m 35s
build with wasm-pack	3m 18s
Check cargo fmt	42s
cargo test (macos)	13m 9s
cargo test (macos-aarch64)	13m 28s
Verify MSRV (Min Supported Rust Version)	9m 31s
cargo test (win64)	1h 12m 39s
Verify Vendored Code	50s
cargo examples (amd64)	14m 27s
cargo doc	4m 31s
cargo test (amd64)	12m 1s
cargo test datafusion-cli (amd64)	4m 35s
cargo test doc (amd64)	17m 32s
check Cargo.toml formatting	2m 54s
clippy	6m 53s
check configs.md and ***_functions.md is up-to-date	3m 33s
cargo test hash collisions (amd64)	28m 8s
Run sqllogictest with Postgres runner	4m 12s
cargo test pyarrow (amd64)	3m 1s
verify benchmark results (amd64)	15m 7s
	4h 6m 47s

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