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https://issues.apache.org/jira/browse/SPARK-20292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964154#comment-15964154
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Liang-Chi Hsieh commented on SPARK-20292:
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I will look into this.
> string representation of TreeNode is messy
> ------------------------------------------
>
> Key: SPARK-20292
> URL: https://issues.apache.org/jira/browse/SPARK-20292
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Wenchen Fan
>
> Currently we have a lot of string representations for QueryPlan/Expression:
> toString, simpleString, verboseString, treeString, sql, etc.
> The logic between them is not very clear and as a result,
> {{Expression.treeString}} is mostly unreadable as it contains a lot
> duplicated information.
> We should clean it up
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