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https://issues.apache.org/jira/browse/HIVE-17651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189632#comment-16189632
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Zoltan Haindrich commented on HIVE-17651:
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it looks like in HIVE-17073 the goal was to enable vectorized operation of this
operator; however due to an early return it might not succeeded...I've post
some patches to check what's going on...
> Profile TableScanOperator in case stats gathering is on
> -------------------------------------------------------
>
> Key: HIVE-17651
> URL: https://issues.apache.org/jira/browse/HIVE-17651
> Project: Hive
> Issue Type: Sub-task
> Reporter: Zoltan Haindrich
>
> It seems to me that there might be some overhead when the operator is
> gathering the stats;
> also check: it seems that in case vectorization is on ; the collected
> rowcount would be invalid
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