Rust

Fix check_not_null_constraints null detection #283

Job	Run time
cargo check	11m 12s
Check cargo fmt	43s
build with wasm-pack	2m 34s
cargo test (macos)	9m 31s
cargo test (macos-aarch64)	13m 11s
Verify MSRV (Min Supported Rust Version)	8m 14s
Verify Vendored Code	58s
cargo test (win64)	58m 53s
check configs.md and ***_functions.md is up-to-date	3m 14s
cargo test hash collisions (amd64)	16m 59s
check Cargo.toml formatting	2m 54s
clippy	5m 59s
cargo doc	4m 10s
cargo test (amd64)	11m 12s
cargo test datafusion-cli (amd64)	3m 49s
cargo test doc (amd64)	16m 3s
cargo examples (amd64)	13m 50s
Run sqllogictest with Postgres runner	3m 45s
cargo test pyarrow (amd64)	2m 53s
verify benchmark results (amd64)	12m 22s
	3h 22m 26s

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