cloud-fan commented on code in PR #42810:
URL: https://github.com/apache/spark/pull/42810#discussion_r1315957135


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2AlterTableCommands.scala:
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@@ -230,6 +230,15 @@ case class AlterColumn(
     val defaultValueChange = setDefaultExpression.map { newDefaultExpression =>
       TableChange.updateColumnDefaultValue(colName, newDefaultExpression)

Review Comment:
   shall we apply the check? then we can save the `if` condition.



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