Minor: Fix grouping set typo #31450

Job	Run time
build with wasm-pack	2m 39s
cargo check	5m 41s
cargo test (win64)	42m 48s
Check cargo fmt	54s
cargo test (macos)	11m 56s
cargo test (macos-aarch64)	11m 8s
Verify MSRV (Min Supported Rust Version)	6m 46s
Verify Vendored Code	1m 36s
cargo examples (amd64)	13m 35s
cargo test (amd64)	10m 14s
check Cargo.toml formatting	3m 1s
clippy	6m 30s
check configs.md is up-to-date	4m 1s
cargo test hash collisions (amd64)	14m 18s
cargo doc	3m 55s
cargo test datafusion-cli (amd64)	4m 40s
cargo test doc (amd64)	15m 41s
Run sqllogictest with Postgres runner	3m 57s
cargo test pyarrow (amd64)	3m 0s
verify benchmark results (amd64)	12m 11s
	2h 58m 31s

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