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https://issues.apache.org/jira/browse/HIVE-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gang Tim Liu updated HIVE-3959:
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Attachment: HIVE-3959.patch.12.txt
> Update Partition Statistics in Metastore Layer
> ----------------------------------------------
>
> Key: HIVE-3959
> URL: https://issues.apache.org/jira/browse/HIVE-3959
> Project: Hive
> Issue Type: Improvement
> Components: Metastore, Statistics
> Reporter: Bhushan Mandhani
> Assignee: Gang Tim Liu
> Priority: Minor
> Attachments: HIVE-3959.patch.1, HIVE-3959.patch.11.txt,
> HIVE-3959.patch.12.txt, HIVE-3959.patch.2
>
>
> When partitions are created using queries ("insert overwrite" and "insert
> into") then the StatsTask updates all stats. However, when partitions are
> added directly through metadata-only partitions (either CLI or direct calls
> to Thrift Metastore) no stats are populated even if hive.stats.reliable is
> set to true. This puts us in a situation where we can't decide if stats are
> truly reliable or not.
> We propose that the "fast stats" (numFiles and totalSize) which don't require
> a scan of the data should always be populated and be completely reliable. For
> now we are still excluding rowCount and rawDataSize because that will make
> these operations very expensive. Currently they are quick metadata-only ops.
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