Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19124#discussion_r137153372
--- 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 --
For this command, it's not easy to get `CatalogTable` at
`DataSourceStrategy`.
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