pan3793 commented on issue #3541:
URL: https://github.com/apache/iceberg/issues/3541#issuecomment-972460374
Spark already told us the dropNamespace should be act as `CASCADE`
Spark `interface SupportsNamespaces extends CatalogPlugin`
```
/**
* Drop a namespace from the catalog, **recursively dropping all objects
within the namespace.**
* .....
*/
boolean dropNamespace(String[] namespace) throws NoSuchNamespaceException;
```
And in `DropNamespaceExec`, Spark know the `CASCADE` flag, and handled by
```
if (!cascade) {
if (catalog.asTableCatalog.listTables(ns).nonEmpty
|| nsCatalog.listNamespaces(ns).nonEmpty) {
throw
QueryExecutionErrors.cannotDropNonemptyNamespaceError(namespace)
}
}
if (!nsCatalog.dropNamespace(ns)) {
throw
QueryExecutionErrors.cannotDropNonemptyNamespaceError(namespace)
}
```
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