Minor: some cosmetics in `filter.rs`, fix clippy due to logical conflict #29075

Job	Run time
Check cargo fmt	43s
cargo check	4m 11s
build with wasm-pack	2m 18s
cargo test (macos)	14m 48s
cargo test (macos-aarch64)	10m 46s
Verify Vendored Code	1m 1s
cargo test (win64)	34m 0s
Verify MSRV (Min Supported Rust Version)	6m 37s
cargo test (amd64)	9m 24s
cargo test datafusion-cli (amd64)	3m 32s
clippy	5m 27s
cargo test hash collisions (amd64)	8m 52s
cargo doc	3m 46s
cargo test doc (amd64)	13m 4s
cargo examples (amd64)	12m 56s
Run sqllogictest with Postgres runner	3m 15s
cargo test pyarrow (amd64)	2m 31s
verify benchmark results (amd64)	10m 33s
check Cargo.toml formatting	2m 45s
check configs.md is up-to-date	2m 29s
	2h 32m 58s

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