Rust

Display ValuesExec schema in EXPLAIN #272

Job	Run time
build with wasm-pack	2m 33s
cargo test (macos)	10m 24s
cargo check	11m 10s
Check cargo fmt	42s
Verify MSRV (Min Supported Rust Version)	8m 12s
Verify Vendored Code	55s
cargo test (win64)	1h 0m 41s
cargo test (macos-aarch64)	11m 15s
cargo test datafusion-cli (amd64)	3m 54s
cargo test (amd64)	10m 55s
cargo doc	3m 56s
cargo test doc (amd64)	15m 53s
cargo examples (amd64)	13m 28s
check Cargo.toml formatting	2m 57s
clippy	6m 18s
check configs.md and ***_functions.md is up-to-date	3m 14s
cargo test hash collisions (amd64)	17m 47s
cargo test pyarrow (amd64)	2m 49s
Run sqllogictest with Postgres runner	3m 33s
verify benchmark results (amd64)	12m 16s
	3h 22m 52s

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