orc
Apache ORC columnar storage format reference. File structure with stripes and indexes, schema types with evolution rules, compression codecs (ZLIB/SNAPPY/ZSTD), orc-tools CLI, Python/Java writer APIs,
SKILL.mdorc/SKILL.md
GitHubApache 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 |