Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17758#discussion_r124796260
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -185,8 +183,21 @@ case class DataSource(
}
SchemaUtils.checkColumnNameDuplication(
--- End diff --
Also, I think we couldn't catch the duplication in case of inferred data
schema except for here. So, I put the check here and in the constructor.
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