One Join Order Does Not Fit All: Reducing Intermediate Results with Per-Split Query Plans
Summary: SplitJoin partitions inputs into heavy/light parts and assigns each split a distinct join order, reducing intermediates for cyclic multi-joins using existing binary engines. DuckDB/Umbra experiments show up to 14.8×/11.6× speedups and 74×/33.1× smaller intermediates. (summarized by gpt-5.6-luna on Aug 17 2026)
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Authors
- 1. Yujun He (Southern University of Science and Technology; University of Wisconsin)
- 2. Hangdong Zhao (Gray Systems Lab, Microsoft)
- 3. Simon Frisk (University of Wisconsin)
- 4. Yifei Yang (University of Wisconsin)
- 5. Kevin Kristensen (University of Wisconsin)
- 6. Paraschos Koutris (University of Wisconsin)
- 7. Xiangyao Yu (University of Wisconsin)
BibTeX Citation
@article{he_vldb26,
title = {{One Join Order Does Not Fit All: Reducing Intermediate Results with Per-Split Query Plans}},
author = {He, Yujun and Zhao, Hangdong and Frisk, Simon and Yang, Yifei and Kristensen, Kevin and Koutris, Paraschos and Yu, Xiangyao},
journal = {PVLDB},
series = {{VLDB} '26},
volume = {19},
number = {9},
pages = {2045--2058},
doi = {10.14778/3819518.3819533},
url = {https://doi.org/10.14778/3819518.3819533},
year = {2026}
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