Nested Parquet Is Flat, Why Not Use It? How To Scan Nested Data With On-the-Fly Key Generation and Joins
Summary: Process nested Parquet in relational engines via on-the-fly join-key generation to reconstruct nesting without materializing an internal format. Scans flat Parquet columns and uses on-the-fly joins to rebuild nesting, delivering vastly faster analytics. (summarized by gpt-5-nano on Feb 09 2026)
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Authors
- 1. Alice Rey (Technical University of Munich)
- 2. Maximilian Rieger (Technical University of Munich)
- 3. Thomas Neumann (Technical University of Munich)
BibTeX Citation
@inproceedings{rey_sigmod25,
title = {{Nested Parquet Is Flat, Why Not Use It? How To Scan Nested Data With On-the-Fly Key Generation and Joins}},
author = {Rey, Alice and Rieger, Maximilian and Neumann, Thomas},
series = {{SIGMOD} '25},
booktitle = {Proceedings of the {ACM} {SIGMOD} International Conference on Management of Data},
publisher = {Association for Computing Machinery},
doi = {10.1145/3725329},
url = {https://dl.acm.org/doi/10.1145/3725329},
year = {2025}
}
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