[jira] [Commented] (SPARK-32510) JDBC doesn't check duplicate column names in nested structures

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-32510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168830#comment-17168830 ] 

Apache Spark commented on SPARK-32510:
--------------------------------------

User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/29317

> JDBC doesn't check duplicate column names in nested structures 
> ---------------------------------------------------------------
>
>                 Key: SPARK-32510
>                 URL: https://issues.apache.org/jira/browse/SPARK-32510
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Maxim Gekk
>            Priority: Major
>
> JdbcUtils.getCustomSchema calls checkColumnNameDuplication() which checks duplicates on top-level but not in nested structures as other built-in datasources do, see
> [https://github.com/apache/spark/blob/8bc799f92005c903868ef209f5aec8deb6ccce5a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala#L822-L823]



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