jerryshao commented on code in PR #9463:
URL: https://github.com/apache/gravitino/pull/9463#discussion_r2610178848


##########
catalogs/catalog-lakehouse-generic/src/main/java/org/apache/gravitino/catalog/lakehouse/lance/LanceTableOperations.java:
##########
@@ -259,8 +260,15 @@ Table createTableInternal(
       throws NoSuchSchemaException, TableAlreadyExistsException {
 
     if (register) {
+      // If this is a register operation, it should be a external table.
+      Map<String, String> stringStringMap = Maps.newHashMap(properties);
+      if (!properties.containsKey(Table.PROPERTY_EXTERNAL)
+          || !Boolean.parseBoolean(properties.get(Table.PROPERTY_EXTERNAL))) {
+        stringStringMap.put(Table.PROPERTY_EXTERNAL, "true");
+      }

Review Comment:
   Whether to drop data is controlled by `external`, why do you mix the behaior 
of `register` with `external`? Why do you assume that the registered table data 
cannot be dropped?



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