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From "Owen O'Malley (JIRA)" <>
Subject [jira] [Updated] (HIVE-9451) Add max size of column dictionaries to ORC metadata
Date Thu, 23 Apr 2015 22:48:39 GMT


Owen O'Malley updated HIVE-9451:
    Attachment: HIVE-9451.patch

This patch adds the maxDictionarySize and configured stripe size to the metadata of ORC files.
I'll need to update the expected results for the qfiles that depend on the size of orc files.

> Add max size of column dictionaries to ORC metadata
> ---------------------------------------------------
>                 Key: HIVE-9451
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 1.2.0
>         Attachments: 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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