What is Apache Parquet? Columns, Encoding, and Performance
Read OriginalThis article details Apache Parquet, a columnar storage format created by Twitter and Cloudera in 2013. It explains how Parquet reorganizes data into row groups and column chunks, enabling column pruning to reduce disk I/O and improve query performance. The article covers dictionary encoding for low-cardinality data and compression algorithms like Snappy and Zstd. It also discusses predicate pushdown and row group skipping, positioning Parquet as a key component in the open source lakehouse ecosystem.
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