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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HIVE-15397) metadata-only queries may return incorrect results with empty tables
Date Fri, 09 Dec 2016 00:21:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15733796#comment-15733796
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Sergey Shelukhin edited comment on HIVE-15397 at 12/9/16 12:21 AM:
-------------------------------------------------------------------

For now, I'm disabling the setting by default and adding safety for the common case.
 [~ashutoshc] [~pxiong] can you take a look? I filed HIVE-15398 to follow up, will update
the descriptions in both shortly


was (Author: sershe):
For now, disable the setting by default and add safety for the common case.
 [~ashutoshc] [~pxiong] can you take a look? I filed HIVE-15398 to follow up, will update
the descriptions in both shortly

> metadata-only queries may return incorrect results with empty tables
> --------------------------------------------------------------------
>
>                 Key: HIVE-15397
>                 URL: https://issues.apache.org/jira/browse/HIVE-15397
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-15397.patch
>
>
> Queries like select 1=1 from t group by 1=1 may return rows, based on OneNullRowInputFormat,
even if the source table is empty. For now, add some basic detection of empty tables and turn
this off by default (since we can't know whether a table is empty or not based on there being
some files, without reading them).



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