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https://issues.apache.org/jira/browse/HIVE-5563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13797016#comment-13797016
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Owen O'Malley commented on HIVE-5563:
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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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