Return int32 for integer type date part #35191

Job	Run time
Check License Header	2m 15s
cargo check	9m 2s
build with wasm-pack	2m 54s
cargo test (macos)	13m 23s
cargo test (macos-aarch64)	12m 38s
Verify Vendored Code	58s
cargo test (win64)	1h 10m 58s
Check cargo fmt	38s
Verify MSRV (Min Supported Rust Version)	8m 56s
cargo examples (amd64)	13m 42s
cargo test (amd64)	11m 51s
cargo test datafusion-cli (amd64)	4m 2s
cargo doc	4m 33s
cargo test doc (amd64)	16m 56s
Run sqllogictest with Postgres runner	3m 52s
cargo test pyarrow (amd64)	2m 54s
verify benchmark results (amd64)	13m 36s
check Cargo.toml formatting	2m 56s
clippy	6m 13s
check configs.md and ***_functions.md is up-to-date	3m 1s
cargo test hash collisions (amd64)	29m 11s
	3h 54m 29s

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