pythonparquetafter-worktutorial
Parquet vs CSV for market data after work: stop shipping giant text files
After-work guide to parquet vs csv market data: when bars and panels should leave CSV behind. Educational only. Not investment advice.
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Tag: parquet
After-work guide to parquet vs csv market data: when bars and panels should leave CSV behind. Educational only. Not investment advice.
Apache Arrow 25.0.0 (10 Jul 2026) plus patch 25.0.1 (10 Aug 2026). Bloom filters fold to the configured FPP, hypot, per-key NULLS FIRST/LAST, ListView in Parquet. 25.0.1: to_pylist without per-element Scalars, SVE unpack fix, Feather deprecation narrowed to V1. Three things to try tonight. Not investment advice.
Official DuckDB v2.0 preview (17 Aug 2026): new parser, storage, and server mode. After-work analysts on CSV/Parquet should stay in-process, pick 1.4 LTS vs 1.5 from the calendar, and back up before 2.0. Spark is not required.