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https://issues.apache.org/jira/browse/HIVE-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carl Steinbach updated HIVE-2185:
---------------------------------
Release Note: This patch added getSerDeStats() methods to the Serializer
and Deserializer interfaces. Consequently, any SerDes which were compiled
against the old interfaces will need to be recompiled against the new
interfaces in order to work against Hive 0.8.0.
> extend table statistics to store the size of uncompressed data (+extend
> interfaces for collecting other types of statistics)
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-2185
> URL: https://issues.apache.org/jira/browse/HIVE-2185
> Project: Hive
> Issue Type: New Feature
> Components: Serializers/Deserializers, Statistics
> Reporter: Tomasz Nykiel
> Assignee: Tomasz Nykiel
> Fix For: 0.8.0
>
> Attachments: HIVE-2185.1.patch, HIVE-2185.2.patch, HIVE-2185.patch
>
>
> Currently, when executing INSERT OVERWRITE and ANALYZE TABLE commands we
> collect statistics about the number of rows per partition/table. Other
> statistics (e.g., total table/partition size) are derived from the file
> system.
> Here, we want to collect information about the sizes of uncompressed data, to
> be able to determine the efficiency of compression.
> Currently, a large part of statistics collection mechanism is hardcoded and
> not-easily extensible for other statistics.
> On top of adding the new statistic collected, it would be desirable to extend
> the collection mechanism, so any new statistics could be added easily.
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