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Posted to issues@hive.apache.org by "Sourabh Badhya (Jira)" <ji...@apache.org> on 2022/12/19 12:36:00 UTC

[jira] [Commented] (HIVE-26788) Update stats of table/partition using noscan operation when stats autogather is enabled

    [ https://issues.apache.org/jira/browse/HIVE-26788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17649302#comment-17649302 ] 

Sourabh Badhya commented on HIVE-26788:
---------------------------------------

Thanks [~dkuzmenko] and [~veghlaci05] for the reviews.

> Update stats of table/partition using noscan operation when stats autogather is enabled
> ---------------------------------------------------------------------------------------
>
>                 Key: HIVE-26788
>                 URL: https://issues.apache.org/jira/browse/HIVE-26788
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Sourabh Badhya
>            Assignee: Sourabh Badhya
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 5h 40m
>  Remaining Estimate: 0h
>
> Currently, statistics are always updated for major compaction and never updated for minor compaction since minor compaction performs little updates on the statistics (such as number of files in table/partition & total size of the table/partition). It is better to utilize NOSCAN operation  for both these compaction since NOSCAN operations performs faster update of statistics and updates the relevant fields such as number of files & total sizes of the table/partitions if stats autogather is enabled. If autostats gather is disabled then go for full update of statistics.



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