fix(spark): reject MapType instead of emitting a childless Arrow List#8811
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robert3005 merged 1 commit intoJul 17, 2026
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SparkToArrowSchema mapped MapType to a childless ArrowType.List, which is an invalid Arrow list (List requires exactly one child). Drop the branch so MapType falls through to the fail-fast UnsupportedOperationException, and add a test. Signed-off-by: jackylee <qcsd2011@gmail.com>
Merging this PR will improve performance by 11.17%
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## Rationale for this change - Closes: #8807 Three benchmarks stayed flaky after #8742, flipping between the same two values on PRs that can't affect them. Same root causes and fixes as #8742: | Benchmark | Seen flaky on | Why | Fix | | --- | --- | --- | --- | | `true_count_vortex_buffer[128]` | ±11.17% on 9 unrelated PRs (#8805, #8811, #8812, #8820, #8843, #8803, …) | a 128-bit popcount measures harness overhead and code layout, not the count | drop the 128 size | | runend `compress[(100000, 4)]` | ±11.9% on #8805, #8750, #8856 | allocates in the timed region; glibc malloc differs across runner images | mimalloc as global allocator | | `cast_decimal` `copy_*[65536]` | identical flags on #8838 and #8724 | same glibc-malloc cause (512 KB alloc per iteration) | mimalloc as global allocator | Left alone: `compact_sliced[(4096, 90)]` (single sighting) and the CUDA walltime benches (hosted-runner walltime noise, a runner config issue). The allocator swap shifts every benchmark in the two touched binaries once — see the comment below. Needs a one-time CodSpeed acknowledgment, like #8742. ## What changes are included in this PR? One commit per benchmark; bench files only. Ran `cargo check` + `clippy` on the three bench targets, smoke-ran the binaries, `cargo +nightly fmt`. --------- Signed-off-by: Claude <noreply@anthropic.com> Co-authored-by: Claude <noreply@anthropic.com>
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SparkToArrowSchemamappedMapTypeto a childlessArrowType.List, which is an invalid Arrow list (a List must have exactly one child). Drop the branch soMapTypefalls through to the existing fail-fastUnsupportedOperationException, and add a test.