Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/17758#discussion_r122867252 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala --- @@ -328,6 +333,9 @@ case class DataSource( "It must be specified manually") } + SchemaUtils.checkSchemaColumnNameDuplication( + dataSchema, "the datasource", sparkSession.sessionState.conf.caseSensitiveAnalysis) --- End diff -- Ah, good catch. I'll try to add tests for that case.
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