Optimize slice for dict and minor changes in other arrays#8321
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Signed-off-by: Adam Gutglick <adam@spiraldb.com>
Signed-off-by: Adam Gutglick <adam@spiraldb.com>
Merging this PR will improve performance by 27.21%
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| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ❌ | Simulation | bitwise_not_vortex_buffer_mut[128] |
216.9 ns | 275.3 ns | -21.19% |
| ❌ | Simulation | bitwise_not_vortex_buffer_mut[1024] |
278.6 ns | 336.9 ns | -17.31% |
| ❌ | Simulation | bitwise_not_vortex_buffer_mut[2048] |
342.2 ns | 400.6 ns | -14.56% |
| ⚡ | Simulation | compare[63] |
360.5 µs | 245 µs | +47.16% |
| ⚡ | Simulation | compare[56] |
327.6 µs | 225.1 µs | +45.55% |
| ⚡ | Simulation | compare[62] |
363.9 µs | 250.2 µs | +45.44% |
| ⚡ | Simulation | compare[63] |
371.2 µs | 255.8 µs | +45.14% |
| ⚡ | Simulation | compare[60] |
353.8 µs | 243.9 µs | +45.05% |
| ⚡ | Simulation | compare[56] |
332.4 µs | 229.8 µs | +44.65% |
| ⚡ | Simulation | compare[62] |
368.7 µs | 255 µs | +44.61% |
| ⚡ | Simulation | compare[61] |
362.7 µs | 250.9 µs | +44.54% |
| ⚡ | Simulation | compare[60] |
358.6 µs | 248.7 µs | +44.22% |
| ⚡ | Simulation | compare[58] |
347.3 µs | 241.1 µs | +44.09% |
| ⚡ | Simulation | compare[59] |
354.5 µs | 246.5 µs | +43.84% |
| ⚡ | Simulation | compare[61] |
367.5 µs | 255.7 µs | +43.75% |
| ⚡ | Simulation | compare[58] |
352.2 µs | 245.9 µs | +43.22% |
| ⚡ | Simulation | compare[57] |
345.9 µs | 241.6 µs | +43.17% |
| ⚡ | Simulation | compare[59] |
359.3 µs | 251.2 µs | +43.03% |
| ⚡ | Simulation | compare[54] |
330.4 µs | 231.7 µs | +42.62% |
| ⚡ | Simulation | compare[55] |
337.2 µs | 236.7 µs | +42.49% |
| ... | ... | ... | ... | ... | ... |
ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.
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Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.
Comparing adamg/dict-slice-thing (915c696) with develop (47d2041)
Signed-off-by: Adam Gutglick <adam@spiraldb.com>
Signed-off-by: Adam Gutglick <adam@spiraldb.com>
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Polar Signals Profiling ResultsLatest Run
Previous Runs (1)
Powered by Polar Signals Cloud |
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Benchmarks: PolarSignals ProfilingVortex (geomean): 0.936x ➖ How to read Verdict and Engines
datafusion / vortex-file-compressed (0.936x ➖, 2↑ 0↓)
No file size changes detected. |
Contributor
Benchmarks: FineWeb NVMeVerdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.964x ➖, 1↑ 0↓)
datafusion / vortex-compact (0.984x ➖, 1↑ 0↓)
datafusion / parquet (0.997x ➖, 0↑ 0↓)
duckdb / vortex-file-compressed (1.003x ➖, 0↑ 1↓)
duckdb / vortex-compact (1.000x ➖, 0↑ 0↓)
duckdb / parquet (1.008x ➖, 0↑ 1↓)
File Size Changes (1 files changed, -0.0% overall, 0↑ 1↓)
Totals:
|
Contributor
Benchmarks: TPC-H SF=1 on NVMEVerdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.959x ➖, 0↑ 0↓)
datafusion / vortex-compact (0.899x ✅, 9↑ 0↓)
datafusion / parquet (0.948x ➖, 3↑ 0↓)
datafusion / arrow (0.785x ✅, 21↑ 0↓)
duckdb / vortex-file-compressed (0.939x ➖, 5↑ 0↓)
duckdb / vortex-compact (0.940x ➖, 7↑ 1↓)
duckdb / parquet (0.944x ➖, 4↑ 1↓)
duckdb / duckdb (0.968x ➖, 0↑ 0↓)
File Size Changes (9 files changed, +0.1% overall, 7↑ 2↓)
Totals:
|
Contributor
Benchmarks: TPC-DS SF=1 on NVMEVerdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.996x ➖, 0↑ 2↓)
datafusion / vortex-compact (1.000x ➖, 1↑ 3↓)
datafusion / parquet (0.987x ➖, 4↑ 1↓)
duckdb / vortex-file-compressed (0.989x ➖, 1↑ 0↓)
duckdb / vortex-compact (0.998x ➖, 1↑ 1↓)
duckdb / parquet (1.007x ➖, 0↑ 1↓)
duckdb / duckdb (1.008x ➖, 1↑ 6↓)
File Size Changes (7 files changed, -0.0% overall, 4↑ 3↓)
Totals:
|
Contributor
Benchmarks: FineWeb S3Verdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (1.260x ➖, 0↑ 3↓)
datafusion / vortex-compact (1.161x ➖, 0↑ 2↓)
datafusion / parquet (1.392x ❌, 0↑ 7↓)
duckdb / vortex-file-compressed (1.168x ➖, 0↑ 2↓)
duckdb / vortex-compact (1.151x ➖, 0↑ 2↓)
duckdb / parquet (1.118x ➖, 0↑ 0↓)
|
Contributor
Benchmarks: Statistical and Population GeneticsVerdict: No clear signal (low confidence) How to read Verdict and Engines
duckdb / vortex-file-compressed (1.005x ➖, 0↑ 0↓)
duckdb / vortex-compact (1.019x ➖, 0↑ 0↓)
duckdb / parquet (1.022x ➖, 0↑ 0↓)
File Size Changes (1 files changed, +0.0% overall, 1↑ 0↓)
Totals:
|
Contributor
Benchmarks: Random AccessVortex (geomean): 0.871x ✅ How to read Verdict and Engines
unknown / unknown (0.961x ➖, 12↑ 2↓)
|
Contributor
Benchmarks: TPC-H SF=10 on NVMEVerdict: No clear signal (low confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.964x ➖, 1↑ 1↓)
datafusion / vortex-compact (0.998x ➖, 0↑ 1↓)
datafusion / parquet (1.003x ➖, 0↑ 1↓)
datafusion / arrow (1.044x ➖, 6↑ 12↓)
duckdb / vortex-file-compressed (1.031x ➖, 0↑ 1↓)
duckdb / vortex-compact (1.019x ➖, 0↑ 0↓)
duckdb / parquet (1.017x ➖, 0↑ 0↓)
duckdb / duckdb (1.069x ➖, 0↑ 5↓)
File Size Changes (27 files changed, +0.0% overall, 11↑ 16↓)
Totals:
|
Contributor
Benchmarks: Clickbench on NVMEVerdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.868x ✅, 15↑ 0↓)
datafusion / parquet (0.817x ✅, 21↑ 1↓)
duckdb / vortex-file-compressed (1.030x ➖, 1↑ 7↓)
duckdb / parquet (0.998x ➖, 1↑ 0↓)
duckdb / duckdb (0.999x ➖, 1↑ 0↓)
File Size Changes (104 files changed, -0.0% overall, 50↑ 54↓)
Totals:
|
Contributor
Benchmarks: TPC-H SF=1 on S3Verdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (1.334x ❌, 0↑ 12↓)
datafusion / vortex-compact (1.223x ➖, 0↑ 8↓)
datafusion / parquet (1.495x ❌, 0↑ 18↓)
duckdb / vortex-file-compressed (1.170x ➖, 0↑ 4↓)
duckdb / vortex-compact (1.196x ➖, 0↑ 4↓)
duckdb / parquet (1.156x ➖, 0↑ 4↓)
|
Contributor
Benchmarks: Appian on NVMEVerdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (0.995x ➖, 1↑ 1↓)
datafusion / parquet (1.004x ➖, 1↑ 1↓)
duckdb / vortex-file-compressed (1.011x ➖, 0↑ 0↓)
duckdb / parquet (1.010x ➖, 0↑ 0↓)
duckdb / duckdb (1.004x ➖, 0↑ 0↓)
File Size Changes (4 files changed, -0.0% overall, 1↑ 3↓)
Totals:
|
Contributor
Benchmarks: CompressionVortex (geomean): 0.994x ➖ How to read Verdict and Engines
unknown / unknown (1.011x ➖, 0↑ 3↓)
|
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Benchmarks: TPC-H SF=10 on S3Verdict: No clear signal (environment too noisy confidence) How to read Verdict and Engines
datafusion / vortex-file-compressed (1.274x ➖, 0↑ 10↓)
datafusion / vortex-compact (1.190x ➖, 0↑ 5↓)
datafusion / parquet (1.333x ❌, 0↑ 11↓)
duckdb / vortex-file-compressed (1.238x ➖, 0↑ 4↓)
duckdb / vortex-compact (1.194x ➖, 0↑ 5↓)
duckdb / parquet (1.205x ➖, 0↑ 3↓)
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connortsui20
reviewed
Jun 9, 2026
Comment on lines
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+245
| ) && value | ||
| .as_ref() | ||
| .as_exact() | ||
| .is_some_and(|v| matches!(v, ScalarValue::Bool(true))) |
connortsui20
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Jun 9, 2026
connortsui20
reviewed
Jun 9, 2026
Comment on lines
40
to
+41
| if let Some(code) = sliced_code.as_opt::<Constant>() { | ||
| let code = code.scalar().as_primitive().as_::<usize>(); | ||
| return if let Some(code) = code { | ||
| let values = array.values().slice(code..code + 1)?; | ||
| Ok(Some( | ||
| DictArray::new( | ||
| ConstantArray::new(0u8, sliced_code.len()).into_array(), | ||
| values, | ||
| ) | ||
| .into_array(), | ||
| )) | ||
| } else { | ||
| Ok(Some( | ||
| ConstantArray::new(Scalar::null(array.dtype().clone()), sliced_code.len()) | ||
| .into_array(), | ||
| )) | ||
| }; | ||
| return slice_constant_code(array, code.scalar(), sliced_code.len()); |
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question (not review): do we have the optimization where if we slice something it can BECOME a constant array? The only cases I can think of this happening would be in runend where we happen to slice into a run
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I don't think so, but maybe I was just looking in the wrong place.
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lgtm, though I am still wondering about those constant codes optimization, it feels like we should have optimized those away before we ever call slice? And then if slicing causes codes to be constant then thats an additional optimization. That can be in a separate PR
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Summary
Includes a few optimizations around array slicing: