fix(spark): reject MapType instead of emitting a childless Arrow List #33519

Job	Run time
lint-toml	6s
Python (test)	2m 15s
measurement_id golden vectors	15s
Python (lint)	36s
Rust build (default features)	2m 27s
Rust build (wasm32 with default features)	55s
Rust build (with tokio dispatcher)	43s
Python CUDA (test)	2m 26s
License Check and Audit Check (advisories)	49s
validate-workflow-yaml	7s
Rust (btrblocks golden corpus)	27s
Java	2m 22s
Check build with minimal dependencies	2m 10s
Rust (lint, no default)	2m 31s
Rust build (all-features)	2m 26s
C++ API	2m 0s
Check generated source files are up to date	37s
C/C++ (lint)	8s
C API test build	34s
WASM integration smoke test	24s
License Check and Audit Check (bans licenses sources)	54s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
DuckDB libraries available in R2	3s
SQL logic tests	1m 43s
Rust (docs)	2m 19s
Rust tests (windows-x64)	7m 27s
Rust (lint)	2m 3s
Rust tests (linux-arm64)	4m 18s
	43m 11s

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