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Posted to issues@spark.apache.org by "Takeshi Yamamuro (JIRA)" <ji...@apache.org> on 2017/08/15 08:09:01 UTC
[jira] [Comment Edited] (SPARK-21363) Prevent column name
duplication in temporary view
[ https://issues.apache.org/jira/browse/SPARK-21363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126847#comment-16126847 ]
Takeshi Yamamuro edited comment on SPARK-21363 at 8/15/17 8:08 AM:
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User 'maropu' has created a pull request for this issue:
https://github.com/apache/spark/pull/18938
was (Author: maropu):
This pr is: https://github.com/apache/spark/pull/18938
> 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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