Github user yhuai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14155#discussion_r75432710
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
    @@ -264,10 +261,8 @@ case class AlterTableUnsetPropertiesCommand(
       extends RunnableCommand {
     
       override def run(sparkSession: SparkSession): Seq[Row] = {
    -    val ident = if (isView) "VIEW" else "TABLE"
         val catalog = sparkSession.sessionState.catalog
         DDLUtils.verifyAlterTableType(catalog, tableName, isView)
    -    DDLUtils.verifyTableProperties(propKeys, s"ALTER $ident")
    --- End diff --
    
    this is removing a property. If we remove it, it is too late to check in 
the external catalog.


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