Alex Merced • 5/24/2026

Using DuckDB and Polars to Query Iceberg Tables

This article details how DuckDB 1.4 LTS and Polars now support full read-write access to Iceberg tables via REST Catalogs, enabling lakehouse workflows without Spark or Flink. It covers DuckDB's Iceberg write support, Polars' streaming sink capabilities, DuckDB-Wasm for browser-based analytics, and practical patterns like data quality profiling and ML feature preprocessing. The post compares both tools, discusses development workflows from local to distributed, and explains when to scale up from single-engine processing.

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#Duckdb #Polars #Lakehouse