# [Apache ORC](https://orc.apache.org/) ORC is a self-describing type-aware columnar file format designed for Hadoop workloads. It is optimized for large streaming reads, but with integrated support for finding required rows quickly. Storing data in a columnar format lets the reader read, decompress, and process only the values that are required for the current query. Because ORC files are type-aware, the writer chooses the most appropriate encoding for the type and builds an internal index as the file is written. Predicate pushdown uses those indexes to determine which stripes in a file need to be read for a particular query and the row indexes can narrow the search to a particular set of 10,000 rows. ORC supports the complete set of types in Hive, including the complex types: structs, lists, maps, and unions. ## ORC Format This project includes ORC specifications and the protobuf definition. `Apache ORC Format 1.0.0` is desinged to be used for `Apache ORC 2.0+`. Releases: * Maven Central:  * Downloads: Apache ORC downloads * Release tags: Apache ORC Format releases * Plan: Apache ORC Format future release plan The current build status: * Main branch  Bug tracking: Apache ORC Format Issues ## Building ``` ./mvnw install ```