pvary commented on issue #3247:
URL: https://github.com/apache/iceberg/issues/3247#issuecomment-938539818


   There are some missing feature in the Hive API. Especially in 2.x, but even 
in 3.x which prevented us to provide alter table support for Hive tables in 
Iceberg code.
   
   That said there is an implementation in the Hive master which allows some of 
the `ALTER` functionality.
   
https://github.com/apache/hive/blob/master/iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergMetaHook.java#L96-L99
   ```
     static final EnumSet<AlterTableType> SUPPORTED_ALTER_OPS = EnumSet.of(
         AlterTableType.ADDCOLS, AlterTableType.REPLACE_COLUMNS, 
AlterTableType.RENAME_COLUMN,
         AlterTableType.ADDPROPS, AlterTableType.DROPPROPS, 
AlterTableType.SETPARTITIONSPEC,
         AlterTableType.UPDATE_COLUMNS);
   ```


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