Merge pull request #6924 from taosdata/fix/TD-5388

[TD-5388]<fix>: fix isUpdateQuery for 'reset query cache' statement

src/client/src/tscUtil.c

@@ -2518,7 +2518,7 @@ bool tscIsUpdateQuery(SSqlObj* pSql) {
   }
 
   SSqlCmd* pCmd = &pSql->cmd;
-  return ((pCmd->command >= TSDB_SQL_INSERT && pCmd->command <= TSDB_SQL_DROP_DNODE) || TSDB_SQL_USE_DB == pCmd->command);
+  return ((pCmd->command >= TSDB_SQL_INSERT && pCmd->command <= TSDB_SQL_DROP_DNODE) || TSDB_SQL_RESET_CACHE == pCmd->command || TSDB_SQL_USE_DB == pCmd->command);
 }
 
 char* tscGetSqlStr(SSqlObj* pSql) {

src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/ResetQueryCacheTest.java

+package com.taosdata.jdbc.cases;
+
+import com.taosdata.jdbc.TSDBDriver;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.sql.*;
+import java.util.Properties;
+
+import static org.junit.Assert.assertEquals;
+
+public class ResetQueryCacheTest {
+
+    static Connection connection;
+    static Statement statement;
+    static String host = "127.0.0.1";
+
+    @Before
+    public void init() {
+        try {
+            Properties properties = new Properties();
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/", properties);
+            statement = connection.createStatement();
+        } catch (SQLException e) {
+            return;
+        }
+    }
+
+    @Test
+    public void testResetQueryCache() throws SQLException {
+        String resetSql = "reset query cache";
+        statement.execute(resetSql);
+        // ResultSet rs = statement.executeQuery(resetSql);
+        // rs.close();
+    }
+
+    @After
+    public void close() {
+        try {
+            if (statement != null)
+                statement.close();
+            if (connection != null)
+                connection.close();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+}
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