XiDuo You created SPARK-39267:
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             Summary: Clean up dsl unnecessary symbol
                 Key: SPARK-39267
                 URL: https://issues.apache.org/jira/browse/SPARK-39267
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.4.0
            Reporter: XiDuo You


dsl is a test helper file which provide easy used functions. But some of these 
are unnecessary, for example:
{code:java}
def subquery(alias: Symbol): LogicalPlan {code}
For a subquery, we only need the name, so a string type parameter is enough. 

 



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