chore(pruning): fix data type and column expression for null and row … #20

Job	Run time
cargo check	4m 51s
Check cargo fmt	40s
build with wasm-pack	2m 22s
cargo test (macos)	24m 5s
Verify MSRV (Min Supported Rust Version)	7m 17s
cargo test (macos-aarch64)	7m 55s
Verify Vendored Code	55s
cargo test (win64)	39m 4s
cargo test (amd64)	9m 53s
cargo test datafusion-cli (amd64)	3m 44s
cargo test doc (amd64)	11m 5s
cargo doc	3m 54s
cargo examples (amd64)	8m 28s
check Cargo.toml formatting	1m 24s
clippy	3m 18s
check configs.md is up-to-date	2m 26s
cargo test hash collisions (amd64)	9m 17s
Run sqllogictest with Postgres runner	3m 2s
cargo test pyarrow (amd64)	2m 37s
verify benchmark results (amd64)	9m 59s
	2h 36m 16s

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