Fix the config 'query_cost_stat_window' cannot be hot loaded #16896

Author: Wei-hao-Li

integration-test/src/test/java/org/apache/iotdb/relational/it/query/recent/informationschema/IoTDBCurrentQueriesIT.java

@@ -64,7 +64,6 @@ public class IoTDBCurrentQueriesIT {
 
   @BeforeClass
   public static void setUp() throws Exception {
-    EnvFactory.getEnv().getConfig().getDataNodeConfig().setQueryCostStatWindow(1);
     EnvFactory.getEnv().initClusterEnvironment();
     createUser("test", "test123123456");
   }
@@ -81,6 +80,7 @@ public void testCurrentQueries() {
           EnvFactory.getEnv().getConnection(ADMIN_NAME, ADMIN_PWD, BaseEnv.TABLE_SQL_DIALECT);
       Statement statement = connection.createStatement();
       statement.execute("USE information_schema");
+      statement.execute("set configuration \"query_cost_stat_window\"='1'");
 
       // 1. query current_queries table
       String sql = "SELECT * FROM current_queries";

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/conf/IoTDBDescriptor.java

@@ -2034,6 +2034,12 @@ public synchronized void loadHotModifiedProps(TrimProperties properties)
               properties.getProperty(
                   "slow_query_threshold",
                   ConfigurationFileUtils.getConfigurationDefaultValue("slow_query_threshold"))));
+      // update query_cost_stat_window
+      conf.setQueryCostStatWindow(
+          Integer.parseInt(
+              properties.getProperty(
+                  "query_cost_stat_window",
+                  ConfigurationFileUtils.getConfigurationDefaultValue("query_cost_stat_window"))));
       // update select into operation max buffer size
       conf.setIntoOperationBufferSizeInByte(
           Long.parseLong(

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/ConfigExecution.java

@@ -354,6 +354,7 @@ public String getUser() {
     return context.getSession().getUserName();
   }
 
+  @Override
   public String getClientHostname() {
     return context.getCliHostname();
   }