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Posted to issues@hive.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2015/04/23 19:16:39 UTC

[jira] [Assigned] (HIVE-9451) Add max size of column dictionaries to ORC metadata

     [ https://issues.apache.org/jira/browse/HIVE-9451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley reassigned HIVE-9451:
-----------------------------------

    Assignee: Owen O'Malley

> Add max size of column dictionaries to ORC metadata
> ---------------------------------------------------
>
>                 Key: HIVE-9451
>                 URL: https://issues.apache.org/jira/browse/HIVE-9451
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> To predict the amount of memory required to read an ORC file we need to know the size of the dictionaries for the columns that we are reading. I propose adding the number of bytes for each column's dictionary to the stripe's column statistics. The file's column statistics would have the maximum dictionary size for each column.



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