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

    https://github.com/apache/spark/pull/19124#discussion_r137170172
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
    @@ -848,4 +851,19 @@ object DDLUtils {
           }
         }
       }
    +
    +  private[sql] def checkFieldNames(table: CatalogTable): Unit = {
    +    val serde = table.storage.serde
    +    if (serde == HiveSerDe.sourceToSerDe("orc").get.serde) {
    +      OrcFileFormat.checkFieldNames(table.dataSchema)
    +    } else if (serde == HiveSerDe.sourceToSerDe("parquet").get.serde) {
    +      ParquetSchemaConverter.checkFieldNames(table.dataSchema)
    +    } else {
    +      table.provider.get.toLowerCase(Locale.ROOT) match {
    --- End diff --
    
    `table.provider` could be `None` in the previous versions of Spark. Thus, 
`.get` is risky.


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