[jira] [Created] (SPARK-21363) Prevent column name duplication in temporary view

["Takeshi Yamamuro (JIRA)" <ji...@apache.org>]

Takeshi Yamamuro created SPARK-21363:
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             Summary: Prevent column name duplication in temporary view
                 Key: SPARK-21363
                 URL: https://issues.apache.org/jira/browse/SPARK-21363
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.1
            Reporter: Takeshi Yamamuro
            Priority: Minor


In SPARK-20460, we refactored some existing checks for column name duplication. The master currently allows name duplication for temporary views like an example below though, IMO we better prevent it along with permanent views (the master prevents the case for the permanent views).

{code}
scala> Seq((1, 1)).toDF("a", "a").createOrReplaceTempView("t")
scala> sql("SELECT * FROM t").show
+---+---+
|  a|  a|
+---+---+
|  1|  1|
+---+---+
{code}



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