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https://issues.apache.org/jira/browse/HIVE-12882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15102588#comment-15102588
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Prasanth Jayachandran commented on HIVE-12882:
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ORC tables/partitions always use noscan by default. In case of ORC, noscan,
partialscan and fullscan are all the same.
> Automatically choose to use noscan for stats collection
> -------------------------------------------------------
>
> Key: HIVE-12882
> URL: https://issues.apache.org/jira/browse/HIVE-12882
> Project: Hive
> Issue Type: Sub-task
> Reporter: Pengcheng Xiong
>
> noscan is leveraging the file system to derive the #rows and rawDataSize.
> According to [~ashutoshc], it now only works with RC and ORC file type. We
> would like Hive to automatically choose to use noscan or scan based on the
> file system when stats task starts or when user issues the same query
> "Analyze ...."
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