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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5563) Skip reading columns in ORC for count(*)
Date Wed, 16 Oct 2013 17:19:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13797016#comment-13797016
] 

Owen O'Malley commented on HIVE-5563:
-------------------------------------

Actually, this was done correctly in HIVE-4113 and then broken in HIVE-5391.

> Skip reading columns in ORC for count(*)
> ----------------------------------------
>
>                 Key: HIVE-5563
>                 URL: https://issues.apache.org/jira/browse/HIVE-5563
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>            Reporter: Owen O'Malley
>
> With HIVE-4113, the semantics of ColumnProjectionUtils.getReadColumnIds was fixed so
that an empty list means no columns instead of all columns. (Except the caveat of the override
of ColumnProjectionUtils.isReadAllColumns.)
> However, ORC's reader wasn't updated so it still reads all columns.



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