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From "Sushanth Sowmyan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9451) Add max size of column dictionaries to ORC metadata
Date Fri, 08 May 2015 23:40:02 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535904#comment-14535904
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Sushanth Sowmyan commented on HIVE-9451:
----------------------------------------

Removing fix version of 1.2.0 in preparation of release, since this is not a blocker for 1.2.0.

> 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
>              Labels: ORC
>         Attachments: HIVE-9451.patch, HIVE-9451.patch
>
>
> 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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