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Posted to issues@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2016/03/09 04:16:40 UTC
[jira] [Commented] (HIVE-13233) Use min and max values to estimate
better stats for comparison operators
[ https://issues.apache.org/jira/browse/HIVE-13233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186414#comment-15186414 ]
Ashutosh Chauhan commented on HIVE-13233:
-----------------------------------------
This is only taking into account >= , > What about other arithmetic expressions like <= , < .
Also, we need recursive implementation for nested expressions.
> Use min and max values to estimate better stats for comparison operators
> ------------------------------------------------------------------------
>
> Key: HIVE-13233
> URL: https://issues.apache.org/jira/browse/HIVE-13233
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13233.patch
>
>
> We should benefit from the min/max values for each column to calculate more precisely the number of rows produced by expressions with comparison operators
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