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A Fast Path for Fixed-Length Lists in Parquet

Gunnar Morling · published 22 July 2026

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https://github.com/apache/arrow/issues/34510

github.com

https://lists.apache.org/thread/qhq33wg1loxhymsyqjnsfsrd82qnv43m

lists.apache.org

https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/36632.pdf

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https://github.com/hardwood-hq/hardwood/blob/main/core/src/main/java/dev/hardwood/internal/reader/FixedSizeListDetector.java

github.com

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parquet.apache.org

https://github.com/duckdb/duckdb/blob/2c2d62b247fdd87311b4f0a00bc7d3e209a0381b/extension/parquet/column_reader.cpp

github.com

https://github.com/hardwood-hq/hardwood-benchmarks/blob/main/results/2026-07-22-fixed-size-list/decode-benchmark.log

github.com

https://github.com/hardwood-hq/hardwood-benchmarks/blob/main/results/2026-07-22-fixed-size-list/fallback-benchmark.log

github.com

https://github.com/openjdk/jmh

github.com

https://github.com/hardwood-hq/hardwood-benchmarks

github.com

https://hn.algolia.com/?query=morling.dev/blog/fast-path-for-fixed-length-lists-in-parquet/

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https://lobste.rs/search?q=domain:morling.dev+title:%22A%20Fast%20Path%20for%20Fixed-Length%20Lists%20in%20Parquet%22&what=stories

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https://www.reddit.com/search/?q=url:morling.dev/blog/fast-path-for-fixed-length-lists-in-parquet/

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