commit | ead7ecd37ba10ce16c9af54d48f5daf800926d38 | [log] [tgz] |
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author | deshanxiao <deshanxiao@microsoft.com> | Tue Jan 10 03:05:40 2023 -0800 |
committer | Dongjoon Hyun <dongjoon@apache.org> | Tue Jan 10 03:05:40 2023 -0800 |
tree | 8733dabf9f484c95a20e227ae96025c238ef4ef5 | |
parent | c38d2204aff36ba97ce693da84292a632e8c3ea6 [diff] |
ORC-1343: Disable ENABLE_INDEXES ### What changes were proposed in this pull request? This is a partial revert of ORC-1283. ### Why are the changes needed? ORC reader assumes built-in indexes always so far. ### How was this patch tested? N/A Closes #1373 from dongjoon-hyun/ORC-1343-1.7. Authored-by: deshanxiao <deshanxiao@microsoft.com> Signed-off-by: Dongjoon Hyun <dongjoon@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 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:
The current build status:
Bug tracking: Apache Jira
The subdirectories are:
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