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https://issues.apache.org/jira/browse/SPARK-28127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28127:
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Assignee: Apache Spark
> Micro optimization on TreeNode's mapChildren method
> ---------------------------------------------------
>
> Key: SPARK-28127
> URL: https://issues.apache.org/jira/browse/SPARK-28127
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yesheng Ma
> Assignee: Apache Spark
> Priority: Major
>
> The {{mapChildren}} method in the {{TreeNode}} class is commonly used. In
> this method, there's a if statement checking non-empty children. However,
> there's a cached lazy val {{containsChild}}, which avoids unnecessary
> computation since this {{containsChild}} is used in other methods anyway.
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