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Posted to issues@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2016/01/15 23:24:39 UTC

[jira] [Commented] (HIVE-12882) Automatically choose to use noscan for stats collection

    [ https://issues.apache.org/jira/browse/HIVE-12882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15102578#comment-15102578 ] 

Pengcheng Xiong commented on HIVE-12882:
----------------------------------------

cc'ing [~prasanth_j]

> 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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