Backport "physical-plan: Cast nested group values back to dictionary if necessary" (#12586) #33606

Job	Run time
cargo check	10m 26s
build with wasm-pack	2m 38s
cargo test (macos)	4m 57s
cargo test (macos-aarch64)	4m 59s
Verify Vendored Code	42s
cargo test (win64)	11m 36s
Check cargo fmt	30s
Verify MSRV (Min Supported Rust Version)	9m 3s
cargo test (amd64)	6m 49s
cargo examples (amd64)	13m 15s
cargo test datafusion-cli (amd64)	4m 10s
clippy	1m 58s
cargo doc	3m 53s
Run sqllogictest with Postgres runner	3m 39s
cargo test pyarrow (amd64)	2m 46s
cargo test doc (amd64)	15m 24s
verify benchmark results (amd64)	12m 34s
check Cargo.toml formatting	3m 4s
check configs.md is up-to-date	2m 42s
cargo test hash collisions (amd64)	6m 48s
	2h 1m 53s

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