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From "Edward Capriolo (JIRA)" <>
Subject [jira] [Commented] (HIVE-5563) Skip reading columns in ORC for count(*)
Date Wed, 16 Oct 2013 17:33:42 GMT


Edward Capriolo commented on HIVE-5563:

Just a note/question? How is rcfile effected by these changes. Do we have api fragmentation
going on are both formats effected? I am not seeing any end-to-end test in hive-5546 what
are we doing to prevent code rot, and to ensure this mistake does not happen again?

> Skip reading columns in ORC for count(*)
> ----------------------------------------
>                 Key: HIVE-5563
>                 URL:
>             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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