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Posted to issues@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2017/10/03 12:16:01 UTC

[jira] [Commented] (HIVE-17651) Profile TableScanOperator in case stats gathering is on

    [ https://issues.apache.org/jira/browse/HIVE-17651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189631#comment-16189631 ] 

Zoltan Haindrich commented on HIVE-17651:
-----------------------------------------

* it turned out that only in case of indexes the TS collects stats
* indexes are not supported for tez (I guess for spark also)

so..probably there is no issue arise from it.

> 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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