Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19124#discussion_r137174215
--- 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 --
Ur, actually. Excluding partition columns was intentional.
Maybe, I used a misleading PR title and description here.
So far, I checked `dataSchema` only. I think partition columns are okay
because they are not a part of Parquet/ORC file schema.
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