Rust

fix case_column_or_null with nullable when conditions #270

Job	Run time
cargo test (macos)	4m 46s
cargo check	1m 52s
build with wasm-pack	1m 51s
Check cargo fmt	37s
cargo test (macos-aarch64)	4m 51s
Verify MSRV (Min Supported Rust Version)	8m 33s
Verify Vendored Code	1m 0s
cargo test (win64)	9m 11s
cargo test datafusion-cli (amd64)	0s
cargo test (amd64)	0s
cargo test doc (amd64)	0s
cargo doc	0s
cargo examples (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test hash collisions (amd64)	0s
clippy	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
check Cargo.toml formatting	0s
check configs.md is up-to-date	0s
	32m 41s

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