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apache / orc / 90a0cf8adc262c00eb592d0977e6f03edb6c9966
commit90a0cf8adc262c00eb592d0977e6f03edb6c9966[log] [tgz]
authorOwen O'Malley <omalley@apache.org>Mon Aug 01 13:59:40 2016 -0700
committerOwen O'Malley <omalley@apache.org>Mon Aug 01 14:00:44 2016 -0700
tree7d5dd9ee6c82909da81724c324350ada6fdc9b38
parent7ac867d13003766c21a5f2468c7e2d6e326675e9 [diff]
HIVE-14333. ORC schema evolution from float to double break predicate pushdown.
(Prasanth Jayachandran reviewed by Matt McCline)

Signed-off-by: Owen O'Malley <omalley@apache.org>
1 file changed
tree: 7d5dd9ee6c82909da81724c324350ada6fdc9b38
  1. c++/
  2. docker/
  3. examples/
  4. java/
  5. proto/
  6. site/
  7. tools/
  8. .gitignore
  9. .travis.yml
  10. CMakeLists.txt
  11. LICENSE
  12. NOTICE
  13. 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 for reading and writing and a C++ library for reading 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.

The current build status:

  • Apache ORC master master build status

Building

  • Install java 1.7 or higher
  • Install maven 3 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
% mvn package

To build only the C++ library:

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