Rust

Handled null formats better - now any null formats will result in a d… #30

Job	Run time
cargo test (win64)	42m 45s
build with wasm-pack	2m 19s
cargo test (macos)	24m 16s
Check cargo fmt	51s
cargo check	3m 10s
cargo test (macos-aarch64)	8m 58s
Verify MSRV (Min Supported Rust Version)	6m 44s
Verify Vendored Code	1m 1s
cargo test (amd64)	9m 48s
cargo test datafusion-cli (amd64)	4m 8s
cargo examples (amd64)	8m 29s
cargo test doc (amd64)	11m 14s
check configs.md is up-to-date	2m 32s
check Cargo.toml formatting	1m 32s
clippy	5m 8s
cargo test hash collisions (amd64)	9m 25s
Run sqllogictest with Postgres runner	3m 15s
cargo doc	3m 46s
cargo test pyarrow (amd64)	2m 20s
verify benchmark results (amd64)	10m 34s
	2h 42m 15s

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