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https://issues.apache.org/jira/browse/SPARK-19658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15873522#comment-15873522
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Apache Spark commented on SPARK-19658:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/16988
> Set NumPartitions of RepartitionByExpression In Analyzer
> --------------------------------------------------------
>
> Key: SPARK-19658
> URL: https://issues.apache.org/jira/browse/SPARK-19658
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> Currently, if {{NumPartitions}} is not set, we will set it using
> `spark.sql.shuffle.partitions` in Planner. However, this is not following
> general resolution process. We should do it in Analyzer and then Optimizer
> can use the value for optimization.
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