Rust

Fix redundant data copying in unnest #73

Job	Run time
cargo check	7m 39s
Check License Header	2m 19s
build with wasm-pack	3m 8s
Check cargo fmt	43s
cargo test (macos)	14m 1s
cargo test (macos-aarch64)	10m 43s
Verify Vendored Code	58s
cargo test (win64)	1h 11m 1s
Verify MSRV (Min Supported Rust Version)	10m 9s
cargo test datafusion-cli (amd64)	4m 42s
cargo doc	5m 23s
cargo examples (amd64)	14m 2s
cargo test (amd64)	6h 0m 1s
cargo test doc (amd64)	17m 9s
Run sqllogictest with Postgres runner	3m 48s
verify benchmark results (amd64)	6h 0m 1s
check Cargo.toml formatting	2m 58s
clippy	6m 14s
check configs.md and ***_functions.md is up-to-date	3m 5s
cargo test hash collisions (amd64)	17m 35s
cargo test pyarrow (amd64)	3m 19s
	15h 18m 58s

Provide feedback