[jira] [Created] (SPARK-39376) Do not output duplicated columns in star expansion of subquery alias of NATURAL/USING JOIN

["Karen Feng (Jira)" <ji...@apache.org>]

Karen Feng created SPARK-39376:
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             Summary: Do not output duplicated columns in star expansion of subquery alias of NATURAL/USING JOIN
                 Key: SPARK-39376
                 URL: https://issues.apache.org/jira/browse/SPARK-39376
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Karen Feng


A bug was introduced in https://issues.apache.org/jira/browse/SPARK-34527 such that the duplicated columns within a NATURAL/USING JOIN were output from the qualified star of a subquery alias. For example:

```
val df1 = Seq((3, 8)).toDF("a", "b") 
val df2 = Seq((8, 7)).toDF("b", "d") 
val joinDF = df1.join(df2, "b")
joinDF.alias("r").select("r.*")
```

Output two duplicate `b` columns.



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