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https://issues.apache.org/jira/browse/SPARK-21273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075504#comment-16075504
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Apache Spark commented on SPARK-21273:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/18548
> Decouple stats propagation from logical plan
> --------------------------------------------
>
> Key: SPARK-21273
> URL: https://issues.apache.org/jira/browse/SPARK-21273
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 2.3.0
>
>
> We currently implement statistics propagation directly in logical plan. Given
> we already have two different implementations, it'd make sense to actually
> decouple the two and add stats propagation using mixin.
> This can also be a powerful pattern in the future to add additional
> properties (e.g. constraints).
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