https://cdelmonte.dev/tags/dictionary-encoding/ Recent content in Dictionary-Encoding on cdelmonte.dev https://cdelmonte.dev/og-default.png https://cdelmonte.dev/og-default.png Hugo -- 0.147.7 en-us Wed, 10 Jun 2026 00:00:00 +0000 https://cdelmonte.dev/explainers/parquet-bit-unpacking-explained/ Wed, 10 Jun 2026 00:00:00 +0000 https://cdelmonte.dev/explainers/parquet-bit-unpacking-explained/ Parquet rarely stores a column’s values directly. Dictionary encoding keeps the distinct values once and represents the column through small bit-packed integer indices. This explainer walks through dictionary encoding, how the indices are bit-packed, and the bit-unpacking step that reconstructs them into an int[] before every dictionary lookup.