Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/19124#discussion_r137171079 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala --- @@ -206,6 +206,9 @@ case class AlterTableAddColumnsCommand( reorderedSchema.map(_.name), "in the table definition of " + table.identifier, conf.caseSensitiveAnalysis) + val newDataSchema = StructType(catalogTable.dataSchema ++ columns) + DDLUtils.checkFieldNames(catalogTable.copy(schema = newDataSchema)) --- End diff -- This should be moved to `verifyAlterTableAddColumn`
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