ivanzlenko commented on code in PR #6648:
URL: https://github.com/apache/ignite-3/pull/6648#discussion_r2382571658


##########
modules/catalog/src/main/java/org/apache/ignite/internal/catalog/storage/UpdateTable.java:
##########
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.catalog.storage;
+
+import static 
org.apache.ignite.internal.catalog.commands.CatalogUtils.defaultZoneIdOpt;
+import static 
org.apache.ignite.internal.catalog.commands.CatalogUtils.replaceSchema;
+import static 
org.apache.ignite.internal.catalog.commands.CatalogUtils.replaceTable;
+import static 
org.apache.ignite.internal.catalog.commands.CatalogUtils.schemaOrThrow;
+import static 
org.apache.ignite.internal.catalog.commands.CatalogUtils.tableOrThrow;
+
+import org.apache.ignite.internal.catalog.Catalog;
+import org.apache.ignite.internal.catalog.descriptors.CatalogSchemaDescriptor;
+import org.apache.ignite.internal.catalog.descriptors.CatalogTableDescriptor;
+import org.apache.ignite.internal.hlc.HybridTimestamp;
+
+/**
+ * This class declares an abstract method for creating a new table descriptor 
and
+ * provides default implementation for applying the table descriptor changes 
to a catalog.
+ */
+abstract class UpdateTable implements UpdateEntry {

Review Comment:
   The main issue with abstract class: whenever we need to implement a class 
which need to implement UpdateTable and some other random interface - it will 
be not possible with the abstract class. 
   And I can see the possibility that we can actually stumble upon this case 
sometime in the future. 



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