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https://issues.apache.org/jira/browse/SPARK-21363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126849#comment-16126849
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Takeshi Yamamuro commented on SPARK-21363:
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We couldn't fix this in 2.x releases for back-compatibility, so we could bring
this up for the next major release (e.g., 3.0 releases).
> 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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