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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/01/18 04:07:00 UTC

[jira] [Commented] (SPARK-37949) Improve Rebalance statistics estimation

    [ https://issues.apache.org/jira/browse/SPARK-37949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477555#comment-17477555 ] 

Apache Spark commented on SPARK-37949:
--------------------------------------

User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/35235

> Improve Rebalance statistics estimation
> ---------------------------------------
>
>                 Key: SPARK-37949
>                 URL: https://issues.apache.org/jira/browse/SPARK-37949
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: XiDuo You
>            Priority: Major
>
> The defualt statistics estimation only consider the size in bytes, which may lost the row rount and columns statistics.
> The `RebalancePartitions` actually does not change the statistics of plan, so we can use the statistics of its child for more accurate.



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