Fix comment

Author: JingsongLi

paimon-api/src/main/java/org/apache/paimon/CoreOptions.java

@@ -2351,6 +2351,7 @@ public InlineElement getDescription() {
                                                     + " Default is 10 * TARGET_FILE_SIZE.")
                                     .build());
 
+    @Immutable
     public static final ConfigOption<Boolean> PK_CLUSTERING_OVERRIDE =
             key("pk-clustering-override")
                     .booleanType()

paimon-core/src/main/java/org/apache/paimon/schema/SchemaManager.java

@@ -78,6 +78,7 @@
 
 import static org.apache.paimon.CoreOptions.AGG_FUNCTION;
 import static org.apache.paimon.CoreOptions.BUCKET_KEY;
+import static org.apache.paimon.CoreOptions.CLUSTERING_COLUMNS;
 import static org.apache.paimon.CoreOptions.DELETION_VECTORS_ENABLED;
 import static org.apache.paimon.CoreOptions.DELETION_VECTORS_MODIFIABLE;
 import static org.apache.paimon.CoreOptions.DISTINCT;
@@ -87,6 +88,7 @@
 import static org.apache.paimon.CoreOptions.IGNORE_UPDATE_BEFORE;
 import static org.apache.paimon.CoreOptions.LIST_AGG_DELIMITER;
 import static org.apache.paimon.CoreOptions.NESTED_KEY;
+import static org.apache.paimon.CoreOptions.PK_CLUSTERING_OVERRIDE;
 import static org.apache.paimon.CoreOptions.SEQUENCE_FIELD;
 import static org.apache.paimon.catalog.AbstractCatalog.DB_SUFFIX;
 import static org.apache.paimon.catalog.Identifier.DEFAULT_MAIN_BRANCH;
@@ -1167,6 +1169,15 @@ public static void checkAlterTableOption(
                                 IGNORE_UPDATE_BEFORE.key()));
             }
         }
+
+        if (CLUSTERING_COLUMNS.key().equals(key)) {
+            if (options.containsKey(PK_CLUSTERING_OVERRIDE.key())) {
+                throw new UnsupportedOperationException(
+                        String.format(
+                                "Cannot change %s when %s enabled.",
+                                CLUSTERING_COLUMNS.key(), PK_CLUSTERING_OVERRIDE.key()));
+            }
+        }
     }
 
     public static void checkResetTableOption(String key) {