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apache / orc / refs/tags/v1.7.8
commit7072f2bb3dd5cfe712267b33445c7bab3baec694[log] [tgz]
authorWilliam Hyun <william@apache.org>Mon Jan 16 13:18:13 2023 -0800
committerWilliam Hyun <william@apache.org>Mon Jan 16 13:18:13 2023 -0800
treec11d84968971a778d7ec65750e34b2caa18c4dad
parentead7ecd37ba10ce16c9af54d48f5daf800926d38 [diff]
Preparing for release 1.7.8

Signed-off-by: William Hyun <william@apache.org>
11 files changed
tree: c11d84968971a778d7ec65750e34b2caa18c4dad
  1. .github/
  2. c++/
  3. cmake_modules/
  4. dev/
  5. docker/
  6. examples/
  7. java/
  8. proto/
  9. site/
  10. tools/
  11. .asf.yaml
  12. .gitignore
  13. CMakeLists.txt
  14. LICENSE
  15. NOTICE
  16. README.md
README.md

Apache ORC

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 File Library

This project includes both a Java library and a C++ library for reading and writing the Optimized Row Columnar (ORC) file format. The C++ and Java libraries are completely independent of each other and will each read all versions of ORC files.

Releases:

  • Latest: Apache ORC releases
  • Maven Central: Maven Central
  • Downloads: Apache ORC downloads
  • Release tags: Apache ORC release tags
  • Plan: Apache ORC future release plan

The current build status:

  • Main branch main build status

Bug tracking: Apache Jira

The subdirectories are:

  • c++ - the c++ reader and writer
  • cmake_modules - the cmake modules
  • docker - docker scripts to build and test on various linuxes
  • examples - various ORC example files that are used to test compatibility
  • java - the java reader and writer
  • proto - the protocol buffer definition for the ORC metadata
  • site - the website and documentation
  • tools - the c++ tools for reading and inspecting ORC files

Building

  • Install java 1.8 or higher
  • Install maven 3.8.6 or higher
  • Install cmake

To build a release version with debug information:

% mkdir build
% cd build
% cmake ..
% make package
% make test-out

To build a debug version:

% mkdir build
% cd build
% cmake .. -DCMAKE_BUILD_TYPE=DEBUG
% make package
% make test-out

To build a release version without debug information:

% mkdir build
% cd build
% cmake .. -DCMAKE_BUILD_TYPE=RELEASE
% make package
% make test-out

To build only the Java library:

% cd java
% ./mvnw package

To build only the C++ library:

% mkdir build
% cd build
% cmake .. -DBUILD_JAVA=OFF
% make package
% make test-out