https://oedokumaci.com/tags/parquet/Recent content in Parquet on HomeHugo -- gohugo.ioen© 2026 Oral Ersoy DokumaciMon, 05 Oct 2026 00:00:00 +0000https://oedokumaci.com/blog/posts/apache-parquet/Mon, 05 Oct 2026 00:00:00 +0000https://oedokumaci.com/blog/posts/apache-parquet/Changing one line from CSV to Parquet makes reading the fares of ten million New York taxi trips 27 times faster, and the file is a sixth of the size. In this chapter, we measure why with Polars, DuckDB, PyArrow, and pandas: columnar storage, types in the file, the footer, encodings, pages, compression, predicate pushdown, and row group size. We also see where row storage still wins.