tag | 2c1ac648c674b8ba166cee735447ab685ad0101e | |
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tagger | Owen O'Malley <omalley@apache.org> | Tue Jun 14 13:30:47 2016 -0700 |
object | 662938edc362ca9ad24c3404a9de8d54adec6bec |
ORC Release 1.1.1
commit | 662938edc362ca9ad24c3404a9de8d54adec6bec | [log] [tgz] |
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author | Owen O'Malley <omalley@apache.org> | Fri Jun 10 12:46:24 2016 -0700 |
committer | Owen O'Malley <omalley@apache.org> | Fri Jun 10 12:47:19 2016 -0700 |
tree | 0da464f4430f112648cf954755a7986c71906084 | |
parent | f79238ec69fe89ff84b8ea9aba8936e116a0a23c [diff] |
Getting ready for the 1.1.1 release canidate. 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