[jira] [Commented] (HIVE-4245) Implement numeric dictionaries in ORC

["Owen O'Malley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616613#comment-13616613 ] 

Owen O'Malley commented on HIVE-4245:
-------------------------------------

If you look at the original ORC github, you can see a float and double redblack tree that I pulled out in getting it ready for the initial push into Apache. 

https://github.com/hortonworks/orc/tree/9cdb2e88d377c801655fbb9015938ea3a93e12ca/src/main/java/org/apache/hadoop/hive/ql/io/orc
                
> Implement numeric dictionaries in ORC
> -------------------------------------
>
>                 Key: HIVE-4245
>                 URL: https://issues.apache.org/jira/browse/HIVE-4245
>             Project: Hive
>          Issue Type: New Feature
>          Components: Serializers/Deserializers
>            Reporter: Owen O'Malley
>            Assignee: Pamela Vagata
>
> For many applications, especially in de-normalized data, there is a lot of redundancy in the numeric columns. Therefore, it would make sense to adaptively use dictionary encodings for numeric columns in addition to string columns.

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