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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2015/04/28 01:58:39 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=14515880#comment-14515880 ]
Prasanth Jayachandran commented on HIVE-9451:
---------------------------------------------
Patch looks good to me. +1. Pending tests. ORC concatenation is not affected by this patch :).
Minor nit: LOG.info instead of sysout in ColumnStatisticsImpl and WriterImpl?
> 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
> 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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