Maxim Gekk created SPARK-32510:
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Summary: 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
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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