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https://issues.apache.org/jira/browse/HIVE-4123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091908#comment-14091908
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Lefty Leverenz commented on HIVE-4123:
--------------------------------------
Done, thanks [~prasanth_j]. Now the description for
*hive.exec.orc.write.format* says:
{quote}
Define the version of the file to write. Possible values are 0.11 and 0.12. If
this parameter is not defined, ORC will use the run length encoding (RLE)
introduced in Hive 0.12. Any value other than 0.11 results in the 0.12 encoding.
Additional values may be introduced in the future (see HIVE-6002).
{quote}
HIVE-6586 (for HiveConf.java updates) has a comment about the new description.
* [Configuration Properties -- hive.exec.orc.write.format |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.write.format]
* [HIVE-6586 comment about new description for hive.exec.orc.write.format |
https://issues.apache.org/jira/browse/HIVE-6586?focusedCommentId=14091905&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14091905]
> The RLE encoding for ORC can be improved
> ----------------------------------------
>
> Key: HIVE-4123
> URL: https://issues.apache.org/jira/browse/HIVE-4123
> Project: Hive
> Issue Type: New Feature
> Components: File Formats
> Affects Versions: 0.12.0
> Reporter: Owen O'Malley
> Assignee: Prasanth J
> Labels: TODOC12, orcfile
> Fix For: 0.12.0
>
> Attachments: HIVE-4123-8.patch, HIVE-4123.1.git.patch.txt,
> HIVE-4123.2.git.patch.txt, HIVE-4123.3.patch.txt, HIVE-4123.4.patch.txt,
> HIVE-4123.5.txt, HIVE-4123.6.txt, HIVE-4123.7.txt, HIVE-4123.8.txt,
> HIVE-4123.8.txt, HIVE-4123.patch.txt, ORC-Compression-Ratio-Comparison.xlsx
>
>
> The run length encoding of integers can be improved:
> * tighter bit packing
> * allow delta encoding
> * allow longer runs
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