Orc

Apache ORC columnar storage format reference. File structure with stripes and indexes, schema types with evolution rules, compression codecs (ZLIB/SNAPPY/ZST...

Apache ORC

Apache ORC columnar storage format reference.

Commands

Command	Description
intro	ORC overview, file structure, vs Parquet
schema	Types, complex types, schema evolution
compression	ZLIB/SNAPPY/LZO/ZSTD codecs, ratios
read	orc-tools CLI, Python/Java read APIs
write	Writer APIs, stripe/buffer sizing
hive	Hive integration, ACID transactions
spark	Spark ORC read/write, pushdown
performance	Bloom filters, indexes, vectorized reads