diff --git a/README-CN.md b/README-CN.md
index 189b7a059a..12ac7b9ee7 100644
--- a/README-CN.md
+++ b/README-CN.md
@@ -352,4 +352,4 @@ TDengine 提供了丰富的应用程序开发接口，其中包括 C/C++、Java
 
 # 加入技术交流群
 
-TDengine 官方社群「物联网大数据群」对外开放，欢迎您加入讨论。搜索微信号 "tdengine"，加小 T 为好友，即可入群。
+TDengine 官方社群「物联网大数据群」对外开放，欢迎您加入讨论。搜索微信号 "tdengine1"，加小 T 为好友，即可入群。
diff --git a/source/libs/executor/src/executil.c b/source/libs/executor/src/executil.c
index c51dc39b5b..c8b16ad83b 100644
--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -1484,14 +1484,23 @@ static int32_t setSelectValueColumnInfo(SqlFunctionCtx* pCtx, int32_t numOfOutpu
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
+  SHashObj *pSelectFuncs = taosHashInit(8, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_ENTRY_LOCK);
   for (int32_t i = 0; i < numOfOutput; ++i) {
     const char* pName = pCtx[i].pExpr->pExpr->_function.functionName;
     if ((strcmp(pName, "_select_value") == 0) || (strcmp(pName, "_group_key") == 0)) {
       pValCtx[num++] = &pCtx[i];
     } else if (fmIsSelectFunc(pCtx[i].functionId)) {
-      p = &pCtx[i];
+      void* data = taosHashGet(pSelectFuncs, pName, strlen(pName));
+      if (taosHashGetSize(pSelectFuncs) != 0 && data == NULL) {
+        p = NULL;
+        break;
+      } else {
+        taosHashPut(pSelectFuncs, pName, strlen(pName), &num, sizeof(num));
+        p = &pCtx[i];
+      }
     }
   }
+  taosHashCleanup(pSelectFuncs);
 
   if (p != NULL) {
     p->subsidiaries.pCtx = pValCtx;
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index f4c86d4849..db1e82b910 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -5326,7 +5326,8 @@ static int32_t checkAlterSuperTableBySchema(STranslateContext* pCxt, SAlterTable
     }
 
     if (TSDB_ALTER_TABLE_UPDATE_COLUMN_BYTES == pStmt->alterType) {
-      if (calcTypeBytes(pStmt->dataType) > TSDB_MAX_FIELD_LEN) {
+      if ((TSDB_DATA_TYPE_VARCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_BINARY_LEN) ||
+          (TSDB_DATA_TYPE_NCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_NCHAR_LEN)) {
         return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_VAR_COLUMN_LEN);
       }
 
@@ -5351,6 +5352,11 @@ static int32_t checkAlterSuperTableBySchema(STranslateContext* pCxt, SAlterTable
       return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_TOO_MANY_COLUMNS);
     }
 
+    if ((TSDB_DATA_TYPE_VARCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_BINARY_LEN) ||
+        (TSDB_DATA_TYPE_NCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_NCHAR_LEN)) {
+      return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_VAR_COLUMN_LEN);
+    }
+
     if (pTableMeta->tableInfo.rowSize + calcTypeBytes(pStmt->dataType) > TSDB_MAX_BYTES_PER_ROW) {
       return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_ROW_LENGTH, TSDB_MAX_BYTES_PER_ROW);
     }
@@ -8322,6 +8328,11 @@ static int32_t buildUpdateColReq(STranslateContext* pCxt, SAlterTableStmt* pStmt
     return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_MODIFY_COL);
   }
 
+  if ((TSDB_DATA_TYPE_VARCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_BINARY_LEN) ||
+      (TSDB_DATA_TYPE_NCHAR == pStmt->dataType.type && calcTypeBytes(pStmt->dataType) > TSDB_MAX_NCHAR_LEN)) {
+    return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_VAR_COLUMN_LEN);
+  }
+
   if (pTableMeta->tableInfo.rowSize + pReq->colModBytes - pSchema->bytes > TSDB_MAX_BYTES_PER_ROW) {
     return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INVALID_ROW_LENGTH, TSDB_MAX_BYTES_PER_ROW);
   }
diff --git a/tests/script/tsim/alter/table.sim b/tests/script/tsim/alter/table.sim
index ded5d6f78a..5f45b446ca 100644
--- a/tests/script/tsim/alter/table.sim
+++ b/tests/script/tsim/alter/table.sim
@@ -657,17 +657,34 @@ if $data20 != null then
   return -1
 endi
 
-print =============== error 
+print =============== error for normal table
 sql create table tb2023(ts timestamp, f int);
 sql_error alter table tb2023 add column v varchar(16375);
 sql_error alter table tb2023 add column v varchar(16385);
 sql_error alter table tb2023 add column v varchar(33100);
 sql alter table tb2023 add column v varchar(16374);
+sql_error alter table tb2023 modify column v varchar(16375);
 sql desc tb2023
 sql alter table tb2023 drop column v
 sql_error alter table tb2023 add column v nchar(4094);
 sql alter table tb2023 add column v nchar(4093);
+sql_error alter table tb2023 modify column v nchar(4094);
 sql desc tb2023
+
+print =============== error for super table
+sql create table stb2023(ts timestamp, f int) tags(t1 int);
+sql_error alter table stb2023 add column v varchar(16375);
+sql_error alter table stb2023 add column v varchar(16385);
+sql_error alter table stb2023 add column v varchar(33100);
+sql alter table stb2023 add column v varchar(16374);
+sql_error alter table stb2023 modify column v varchar(16375);
+sql desc stb2023
+sql alter table stb2023 drop column v
+sql_error alter table stb2023 add column v nchar(4094);
+sql alter table stb2023 add column v nchar(4093);
+sql_error alter table stb2023 modify column v nchar(4094);
+sql desc stb2023
+
 print ======= over
 sql drop database d1
 sql select * from information_schema.ins_databases
diff --git a/tests/script/tsim/parser/alter_column.sim b/tests/script/tsim/parser/alter_column.sim
index c70a604c73..d569e47735 100644
--- a/tests/script/tsim/parser/alter_column.sim
+++ b/tests/script/tsim/parser/alter_column.sim
@@ -48,7 +48,7 @@ sql_error alter table tb modify column c2 binary(10);
 sql_error alter table tb modify column c2 binary(9);
 sql_error alter table tb modify column c2 binary(-9);
 sql_error alter table tb modify column c2 binary(0);
-sql alter table tb modify column c2 binary(17000);
+sql_error alter table tb modify column c2 binary(17000);
 sql_error alter table tb modify column c2 nchar(30);
 sql_error alter table tb modify column c3 double;
 sql_error alter table tb modify column c3 nchar(10);
diff --git a/tests/system-test/0-others/user_privilege.py b/tests/system-test/0-others/user_privilege.py
index 6d49ebfbfe..d1b93f6942 100644
--- a/tests/system-test/0-others/user_privilege.py
+++ b/tests/system-test/0-others/user_privilege.py
@@ -29,6 +29,7 @@ class TDTestCase:
         self.stbname = 'stb'
         self.binary_length = 20  # the length of binary for column_dict
         self.nchar_length = 20  # the length of nchar for column_dict
+        self.dbnames = ['db1', 'db2']
         self.column_dict = {
             'ts': 'timestamp',
             'col1': 'float',
@@ -57,21 +58,25 @@ class TDTestCase:
     def create_user(self):
         user_name = 'test'        
         tdSql.execute(f'create user {user_name} pass "test"')
-        tdSql.execute(f'grant read on db.stb with t2 = "Beijing" to {user_name}')
+        tdSql.execute(f'grant read on {self.dbnames[0]}.{self.stbname} with t2 = "Beijing" to {user_name}')
+        tdSql.execute(f'grant write on {self.dbnames[1]}.{self.stbname} with t1 = 2 to {user_name}')
                 
     def prepare_data(self):
-        tdSql.execute(self.setsql.set_create_stable_sql(self.stbname, self.column_dict, self.tag_dict))
-        for i in range(self.tbnum):
-            tdSql.execute(f'create table {self.stbname}_{i} using {self.stbname} tags({self.tag_list[i]})')
-            for j in self.values_list:
-                tdSql.execute(f'insert into {self.stbname}_{i} values({j})')
+        for db in self.dbnames:
+            tdSql.execute(f"create database {db}")
+            tdSql.execute(f"use {db}")
+            tdSql.execute(self.setsql.set_create_stable_sql(self.stbname, self.column_dict, self.tag_dict))
+            for i in range(self.tbnum):
+                tdSql.execute(f'create table {self.stbname}_{i} using {self.stbname} tags({self.tag_list[i]})')
+                for j in self.values_list:
+                    tdSql.execute(f'insert into {self.stbname}_{i} values({j})')
     
-    def user_privilege_check(self):
+    def user_read_privilege_check(self, dbname):
         testconn = taos.connect(user='test', password='test')        
         expectErrNotOccured = False
         
         try:
-            sql = "select count(*) from db.stb where t2 = 'Beijing'"
+            sql = f"select count(*) from {dbname}.stb where t2 = 'Beijing'"
             res = testconn.query(sql)
             data = res.fetch_all()
             count = data[0][0]            
@@ -85,11 +90,30 @@ class TDTestCase:
             tdLog.exit(f"{sql}, expect result doesn't match")
         pass
     
+    def user_write_privilege_check(self, dbname):
+        testconn = taos.connect(user='test', password='test')        
+        expectErrNotOccured = False
+        
+        try:            
+            sql = f"insert into {dbname}.stb_1 values(now, 1.1, 200, 0.3)"
+            testconn.execute(sql)            
+        except BaseException:
+            expectErrNotOccured = True
+        
+        if expectErrNotOccured:
+            caller = inspect.getframeinfo(inspect.stack()[1][0])
+            tdLog.exit(f"{caller.filename}({caller.lineno}) failed: sql:{sql}, expect error not occured")
+        else:
+            pass
+    
     def user_privilege_error_check(self):
         testconn = taos.connect(user='test', password='test')        
         expectErrNotOccured = False
         
-        sql_list = ["alter talbe db.stb_1 set t2 = 'Wuhan'", "drop table db.stb_1"]
+        sql_list = [f"alter talbe {self.dbnames[0]}.stb_1 set t2 = 'Wuhan'", 
+                    f"insert into {self.dbnames[0]}.stb_1 values(now, 1.1, 200, 0.3)", 
+                    f"drop table {self.dbnames[0]}.stb_1", 
+                    f"select count(*) from {self.dbnames[1]}.stb"]
         
         for sql in sql_list:
             try:
@@ -104,11 +128,11 @@ class TDTestCase:
                 tdLog.exit(f"{caller.filename}({caller.lineno}) failed: sql:{sql}, expect error not occured")
         pass
 
-    def run(self):
-        tdSql.prepare()        
+    def run(self):           
         self.prepare_data()
         self.create_user()
-        self.user_privilege_check()
+        self.user_read_privilege_check(self.dbnames[0])
+        self.user_write_privilege_check(self.dbnames[1])
         self.user_privilege_error_check()
                 
     def stop(self):