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https://issues.apache.org/jira/browse/SPARK-16756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396340#comment-15396340
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Dongjoon Hyun commented on SPARK-16756:
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If there is anything you have in mind, please give me advice.
> Add `sql` function to LogicalPlan and `NonSQLPlan` trait
> --------------------------------------------------------
>
> Key: SPARK-16756
> URL: https://issues.apache.org/jira/browse/SPARK-16756
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Dongjoon Hyun
>
> Like `Expression`, this issue adds `sql` function for `LogicalPlan` and
> `NonSQLPlan` trait. The method will be `abstract` method. All logical plan
> should implement that or use trait `NonSQLPlan` explicitly.
> {code}
> /**
> * Returns SQL representation of this plan. For the plans extending
> [[NonSQLPlan]],
> * this method may return an arbitrary user facing string.
> */
> def sql: String
> {code}
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