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From "Zoltan Haindrich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18140) Partitioned tables statistics can go wrong in basic stats mixed case
Date Tue, 19 Jun 2018 14:11:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16517140#comment-16517140
] 

Zoltan Haindrich commented on HIVE-18140:
-----------------------------------------

[~ashutoshc] Could you please take a look?

> Partitioned tables statistics can go wrong in basic stats mixed case
> --------------------------------------------------------------------
>
>                 Key: HIVE-18140
>                 URL: https://issues.apache.org/jira/browse/HIVE-18140
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>         Attachments: HIVE-18140.01.patch, HIVE-18140.01wip01.patch, HIVE-18140.01wip03.patch,
HIVE-18140.01wip04.patch, HIVE-18140.02.patch, HIVE-18140.02wip01.patch, HIVE-18140.03.patch,
HIVE-19140.02wip02.patch, HIVE-19727.02wip03.patch
>
>
> suppose the following scenario:
> * part1 has basic stats {{RC=10,DS=1K}}
> * all other partition has no basic stats (and a bunch of rows)
> then [this|https://github.com/apache/hive/blob/d9924ab3e285536f7e2cc15ecbea36a78c59c66d/ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java#L378]
condition would be false; which in turn produces estimations for the whole partitioned table:
{{RC=10,DS=1K}}



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