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Posted to issues@spark.apache.org by "Yesheng Ma (JIRA)" <ji...@apache.org> on 2019/06/20 22:45:00 UTC

[jira] [Created] (SPARK-28127) Micro optimization on TreeNode's mapChildren method

Yesheng Ma created SPARK-28127:
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             Summary: 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


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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