ottomata commented on PR #21012:
URL: https://github.com/apache/spark/pull/21012#issuecomment-1873419167

   Starting to try this.  I think there is more to change than just the list of 
datasources for which `verifyAlterTableAddColumn` will throw 
`alterAddColNotSupportDatasourceTableError`.
   
   In this 
[commit](https://github.com/apache/spark/compare/master...ottomata:spark:SPARK-23890-add-nested-column),
 I've done so, but now a check is failing in ResolveCatalogSession.  It looks 
like even with `USING json` or `USING hive`, [this case 
match](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveSessionCatalog.scala#L55-L60)
 against `ResolvedV1TableIdentifier` is matching, causing 
   
   ```
   [UNSUPPORTED_FEATURE.TABLE_OPERATION] The feature is not supported: Table 
`spark_catalog`.`default`.`t1` does not support ADD COLUMN with qualified 
column. Please check the current catalog and namespace to make sure the 
qualified table name is expected, and also check the catalog implementation 
which is configured by "spark.sql.catalog". SQLSTATE: 0A000
   ```
   
   to be thrown.
   
   @cloud-fan, 
   Do we need to an another case in ResolveCatalogSession before this one to 
also allow these v2 datasources, even though they have v1 compatibility 
TableIdentifiers (?) to continue with the ALTER command?


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