szehon-ho commented on code in PR #50864:
URL: https://github.com/apache/spark/pull/50864#discussion_r2085719506
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/ColumnDefinition.scala:
##########
@@ -233,4 +246,13 @@ case class DefaultValueExpression(
case _ =>
throw QueryCompilationErrors.defaultValueNotConstantError(statement,
colName, originalSQL)
}
+
+ // Convert the default expression to DefaultValue, which is required by DS
v2 APIs.
+ def toV2CurrentDefault(statement: String, colName: String): DefaultValue =
child match {
Review Comment:
"Alter table alter column" doesnt change 'exists default', so we can use the
narrower 'DefaultValue' class here that doesnt have that field.
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