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https://issues.apache.org/jira/browse/HIVE-9451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14515880#comment-14515880
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Prasanth Jayachandran commented on HIVE-9451:
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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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