tag | 6c6238e27894be50623ce6957cbfac0fb61ae7b6 | |
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tagger | Owen O'Malley <omalley@apache.org> | Fri Jul 08 18:00:15 2016 -0700 |
object | 1b5544f7eb1d046e3d59449c3de3a608453f41d5 |
ORC release 1.1.2
commit | 1b5544f7eb1d046e3d59449c3de3a608453f41d5 | [log] [tgz] |
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author | Owen O'Malley <omalley@apache.org> | Tue Jul 05 13:41:28 2016 -0700 |
committer | Owen O'Malley <omalley@apache.org> | Tue Jul 05 13:41:28 2016 -0700 |
tree | 5bcbf18fb6015accd3e1cadb8f744eaa8502e968 | |
parent | 98fc5627508612f405f0f69dd719787b2f127b56 [diff] |
ORC-78. Add missing license headers. (omalley) Signed-off-by: Owen O'Malley <omalley@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.
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.
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