korlov42 commented on code in PR #6712:
URL: https://github.com/apache/ignite-3/pull/6712#discussion_r2451731412


##########
modules/catalog/src/main/java/org/apache/ignite/internal/catalog/commands/CreateTableCommand.java:
##########
@@ -127,13 +139,36 @@ public List<UpdateEntry> get(UpdateContext updateContext) 
{
 
         ensureNoTableIndexOrSysViewExistsWithGivenName(schema, tableName);
 
+        int id = catalog.objectIdGenState();
+        int tableId = id++;
+        int pkIndexId = id++;
+
+        // We will have at max 5 entries if there is lazy default data zone 
creation action is needed.
+        List<UpdateEntry> updateEntries = new ArrayList<>(5);
+
         CatalogZoneDescriptor zone;
         if (zoneName == null) {
             if (catalog.defaultZone() == null) {
-                throw new CatalogValidationException("The zone is not 
specified. Please specify zone explicitly or set default one.");
+                int zoneId = id++;
+
+                zone = new CatalogZoneDescriptor(

Review Comment:
   tbh, I'm not a big fun a modifying existing tests as it easy to miss 
something or even accidentally broke old tests.
   
   Let's add minimal tests for following scenarios:
   - a new zone create lazily on a table creation
   - a new zone _is not_ created when there is already exists default
   - table is created successfully when default zone is not set, but there is 
non default one with name equal to `DEFAULT_ZONE_NAME`. Catalog must not have 
multiple zones with similar name



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