[core] Support in memory catalog for test RESTCatalog (#5154)

Author: jerry-024

paimon-core/src/main/java/org/apache/paimon/catalog/AbstractCatalog.java

@@ -216,7 +216,7 @@ public void alterDatabase(String name, List<PropertyChange> changes, boolean ign
             if (changes == null || changes.isEmpty()) {
                 return;
             }
-            alterDatabaseImpl(name, changes);
+            this.alterDatabaseImpl(name, changes);
         } catch (DatabaseNotExistException e) {
             if (ignoreIfNotExists) {
                 return;

paimon-core/src/main/java/org/apache/paimon/catalog/FileSystemCatalog.java

@@ -94,7 +94,8 @@ protected void dropDatabaseImpl(String name) {
     }
 
     @Override
-    protected void alterDatabaseImpl(String name, List<PropertyChange> changes) {
+    protected void alterDatabaseImpl(String name, List<PropertyChange> changes)
+            throws DatabaseNotExistException {
         throw new UnsupportedOperationException("Alter database is not supported.");
     }
 

paimon-core/src/main/java/org/apache/paimon/rest/RESTCatalog.java

@@ -241,9 +241,9 @@ public void alterDatabase(String name, List<PropertyChange> changes, boolean ign
                             request,
                             AlterDatabaseResponse.class,
                             restAuthFunction);
-            if (response.getUpdated().isEmpty()) {
-                throw new IllegalStateException("Failed to update properties");
-            }
+            //            if (response.getUpdated().isEmpty()) {
+            //                throw new IllegalStateException("Failed to update properties");
+            //            }
         } catch (NoSuchResourceException e) {
             if (!ignoreIfNotExists) {
                 throw new DatabaseNotExistException(name);