Apache ORC columnar storage format reference.
CommandDescriptionintroORC overview, file structure, vs ParquetschemaTypes, complex types, schema evolutioncompressionZLIB/SNAPPY/LZO/ZSTD codecs, ratiosreadorc-tools CLI, Python/Java read APIswriteWriter APIs, stripe/buffer sizinghiveHive integration, ACID transactionssparkSpark ORC read/write, pushdownperformanceBloom filters, indexes, vectorized reads