[enhancement](regression) Add a case to check if light_schema_change=true when creating table (#18889)

regression-test/suites/schema_change_p0/test_light_schema_change_default.groovy

@@ -0,0 +1,37 @@
+// 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.
+
+suite ("test_lsc_default") {
+    def table = "test_lsc_default"
+    sql "DROP TABLE IF EXISTS ${table}"
+
+    sql """CREATE TABLE IF NOT EXISTS `${table}` (
+        `siteid` int(11) NULL COMMENT "",
+        `citycode` int(11) NULL COMMENT "",
+        `userid` int(11) NULL COMMENT "",
+        `pv` int(11) NULL COMMENT ""
+        ) ENGINE=OLAP
+        DUPLICATE KEY(`siteid`)
+        COMMENT "OLAP"
+        DISTRIBUTED BY HASH(`siteid`) BUCKETS 1
+        PROPERTIES (
+        "replication_allocation" = "tag.location.default: 1"
+        );"""
+    
+    def result = sql "show create table ${table};"
+    assertTrue(result[0][1].contains("\"light_schema_change\" = \"true\""))
+}