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https://issues.apache.org/jira/browse/HIVE-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091873#comment-14091873
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Lefty Leverenz commented on HIVE-4324:
--------------------------------------
This added configuration parameter
*hive.exec.orc.dictionary.key.size.threshold* to HiveConf.java in 0.12.0. It's
documented in the wiki here:
* [Configuration Properties -- hive.exec.orc.dictionary.key.size.threshold |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.exec.orc.dictionary.key.size.threshold]
> ORC Turn off dictionary encoding when number of distinct keys is greater than
> threshold
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-4324
> URL: https://issues.apache.org/jira/browse/HIVE-4324
> Project: Hive
> Issue Type: Sub-task
> Components: File Formats
> Affects Versions: 0.11.0
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Fix For: 0.12.0
>
> Attachments: HIVE-4324.1.patch.txt, HIVE-4324.D12045.1.patch,
> HIVE-4324.D12045.2.patch, HIVE-4324.D12045.2.patch, HIVE-4324.D12045.3.patch
>
>
> Add a configurable threshold so that if the number of distinct values in a
> string column is greater than that fraction of non-null values, dictionary
> encoding is turned off.
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