mchades commented on code in PR #8456:
URL: https://github.com/apache/gravitino/pull/8456#discussion_r2357241070


##########
catalogs/catalog-jdbc-oceanbase/src/test/java/org/apache/gravitino/catalog/oceanbase/operation/TestOceanBaseTableOperations.java:
##########
@@ -1133,4 +1133,37 @@ public boolean isMySQLDriverVersionSupported(String 
driverVersion) {
         operationsWithOceanBaseDriver.calculateDatetimePrecision("TIME", 10, 
0),
         "TIME type should return precision for OceanBase driver");
   }
+
+  @Test
+  public void testAlterTableSkipsEmptySql() {
+    String tableName = RandomStringUtils.randomAlphabetic(16).toLowerCase() + 
"_skip_empty_sql";
+    List<JdbcColumn> columns = new ArrayList<>();
+    columns.add(
+        JdbcColumn.builder()
+            .withName("col_1")
+            .withType(Types.IntegerType.get())
+            .withNullable(false)
+            .build());
+
+    // Create table
+    TABLE_OPERATIONS.create(
+        TEST_DB_NAME,
+        tableName,
+        columns.toArray(new JdbcColumn[0]),
+        "test_table",
+        Collections.emptyMap(),
+        null,
+        Distributions.NONE,
+        Indexes.EMPTY_INDEXES);
+
+    // Alter table with one valid change and one empty SQL change
+    TableChange validChange =
+        TableChange.updateColumnComment(new String[] {"col_1"}, "Updated 
comment");
+    TableChange emptyChange = TableChange.deleteColumn(new String[] 
{"non_existent_col"}, true);

Review Comment:
   why did you say the `deleteColumn` change is an empty SQL change? I saw it 
will skipe the empty generated SQL by:
   
https://github.com/apache/gravitino/blob/f70a235227042f505cd6ec6982497b5e4c7961ca/catalogs/catalog-jdbc-oceanbase/src/main/java/org/apache/gravitino/catalog/oceanbase/operation/OceanBaseTableOperations.java#L275-L281



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