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perf: Parallelize parquet metadata deserialization #17399

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merged 1 commit into from
Jul 3, 2024
Merged

perf: Parallelize parquet metadata deserialization #17399

merged 1 commit into from
Jul 3, 2024

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ritchie46
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Deserializing wide parquet metadata is expensive. This ensures we do it in parallel.

closes #17259

@nameexhaustion FYI.

@github-actions github-actions bot added performance Performance issues or improvements python Related to Python Polars rust Related to Rust Polars labels Jul 3, 2024
@ritchie46 ritchie46 merged commit 3a3600c into main Jul 3, 2024
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@ritchie46 ritchie46 deleted the meta branch July 3, 2024 13:02
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Ah, in hindsight the code did seem to not really want to parse the metadata 😅

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Loading wide parquet data with scan_parquet is orders of magnitude slower than long data
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@ritchie46 @nameexhaustion