Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/19124#discussion_r137180809 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala --- @@ -848,4 +851,19 @@ object DDLUtils { } } } + + private[sql] def checkFieldNames(table: CatalogTable): Unit = { --- End diff -- I'll rename this to `checkDataSchemaFieldNames`.
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