DuckDB chunk exporter - #8520
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Signed-off-by: "Nicholas Gates" <nick@nickgates.com>
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Merging this PR will not alter performance
|
| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ❌ | Simulation | chunked_varbinview_canonical_into[(1000, 10)] |
154.9 µs | 190.7 µs | -18.79% |
| ❌ | Simulation | decompress_rd[f64, (100000, 0.01)] |
843 µs | 1,021 µs | -17.43% |
| ❌ | Simulation | chunked_varbinview_into_canonical[(1000, 10)] |
170.1 µs | 205.8 µs | -17.35% |
| ⚡ | Simulation | take_10k_random |
254.3 µs | 196.5 µs | +29.4% |
| ⚡ | Simulation | take_10k_contiguous |
275.4 µs | 217.8 µs | +26.47% |
| ⚡ | Simulation | patched_take_10k_contiguous_patches |
289.3 µs | 230.7 µs | +25.4% |
| ⚡ | Simulation | patched_take_10k_random |
302 µs | 243.3 µs | +24.1% |
| ⚡ | Simulation | decompress_rd[f64, (100000, 0.1)] |
1,021.3 µs | 842.8 µs | +21.18% |
| ⚡ | Simulation | bitwise_not_vortex_buffer_mut[128] |
244.4 ns | 215.3 ns | +13.55% |
| ⚡ | Simulation | chunked_varbinview_opt_canonical_into[(100, 100)] |
339.4 µs | 304.5 µs | +11.47% |
| ⚡ | Simulation | bitwise_not_vortex_buffer_mut[1024] |
304.7 ns | 275.6 ns | +10.58% |
Tip
Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.
Comparing ngates/duckdb-chunk-exporter (aca3105) with develop (5df0f94)
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Polar Signals Profiling ResultsLatest Run
Powered by Polar Signals Cloud |
Contributor
Benchmarks: PolarSignals Profiling (base)Vortex (geomean): 0.905x ➖ How to read Verdict and Engines
datafusion / vortex-file-compressed (0.905x ➖, 3↑ 0↓)
File Size Changes (1 files changed, -0.0% overall, 0↑ 1↓)
Totals:
|
Contributor
Benchmarks: FineWeb NVMe (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.967x ➖, 2↑ 0↓)
datafusion / parquet (0.946x ➖, 1↑ 0↓)
duckdb / vortex-file-compressed (0.975x ➖, 0↑ 0↓)
duckdb / parquet (0.946x ➖, 2↑ 0↓)
File Size Changes (3 files changed, -46.3% overall, 0↑ 3↓)
Totals:
|
Contributor
Benchmarks: TPC-H SF=1 on NVME (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.988x ➖, 0↑ 0↓)
datafusion / parquet (0.995x ➖, 0↑ 1↓)
datafusion / arrow (0.996x ➖, 2↑ 2↓)
duckdb / vortex-file-compressed (0.988x ➖, 0↑ 0↓)
duckdb / parquet (1.012x ➖, 0↑ 1↓)
File Size Changes (19 files changed, -44.5% overall, 4↑ 15↓)
Totals:
|
Contributor
Benchmarks: TPC-DS SF=1 on NVME (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (1.044x ➖, 1↑ 5↓)
datafusion / parquet (1.017x ➖, 2↑ 1↓)
duckdb / vortex-file-compressed (1.016x ➖, 1↑ 6↓)
duckdb / parquet (1.030x ➖, 0↑ 7↓)
File Size Changes (49 files changed, -43.5% overall, 3↑ 46↓)
Totals:
|
Contributor
Benchmarks: FineWeb S3 (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.954x ➖, 0↑ 1↓)
datafusion / parquet (0.954x ➖, 0↑ 0↓)
duckdb / vortex-file-compressed (0.987x ➖, 0↑ 0↓)
duckdb / parquet (0.968x ➖, 0↑ 0↓)
|
Contributor
Benchmarks: Statistical and Population Genetics (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
duckdb / vortex-file-compressed (0.998x ➖, 0↑ 0↓)
duckdb / parquet (0.995x ➖, 0↑ 0↓)
File Size Changes (3 files changed, -32.3% overall, 0↑ 3↓)
Totals:
|
Contributor
Benchmarks: Clickbench on NVME (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.995x ➖, 0↑ 0↓)
datafusion / parquet (0.998x ➖, 1↑ 0↓)
duckdb / vortex-file-compressed (0.980x ➖, 3↑ 0↓)
duckdb / parquet (1.000x ➖, 0↑ 1↓)
File Size Changes (201 files changed, -39.1% overall, 58↑ 143↓)
Totals:
|
Contributor
Benchmarks: TPC-H SF=10 on NVME (base)Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.947x ➖, 0↑ 0↓)
datafusion / parquet (0.956x ➖, 0↑ 0↓)
datafusion / arrow (0.940x ➖, 4↑ 1↓)
duckdb / vortex-file-compressed (0.971x ➖, 0↑ 0↓)
duckdb / parquet (0.987x ➖, 0↑ 0↓)
File Size Changes (49 files changed, -44.5% overall, 9↑ 40↓)
Totals:
|
Contributor
Benchmarks: TPC-H SF=1 on S3 (base)Verdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.914x ➖, 0↑ 0↓)
datafusion / parquet (0.980x ➖, 1↑ 0↓)
duckdb / vortex-file-compressed (0.915x ➖, 0↑ 0↓)
duckdb / parquet (0.912x ➖, 0↑ 0↓)
|
gatesn
enabled auto-merge (squash)
June 20, 2026 19:34
Signed-off-by: "Nicholas Gates" <nick@nickgates.com>
robert3005
reviewed
Jun 22, 2026
Comment on lines
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+107
| for field in &self.fields { | ||
| chunk_len = field.preferred_batch_len(position, chunk_len); | ||
| } |
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there's a bit of inconsistent style where struct exporter does a fold and this does a loop
robert3005
disabled auto-merge
June 22, 2026 10:24
robert3005
approved these changes
Jun 22, 2026
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DuckDB vectors are allowed to be shorter than the standard vector size, so the Vortex exporter now lets column exporters cap the next output batch if they wish.
Chunked arrays use this hook to emit one DuckDB vector per inner chunk segment. I ran into a bad case this allowed preserving dictionary vectors for chunked dictionary arrays instead of the catastrophic case of flattening or remapping dictionaries across chunk boundaries.