Minor improvement to 'setErrMsg'

1. code like `char msg[] = "xxxxxx"` unnecessarily copied the string to stack, changed to `const char* msg = "xxxxxx"`.
2. the 2rd argument of `setErrMsg` is changed from `char*` to `const char*`.
3. the 3rd argument of `setErrMsg` is removed as `strncpy` stops copying at the end of source string.

src/client/src/tscParseInsert.c

@@ -348,7 +348,7 @@ int32_t tsParseOneColumnData(SSchema* pSchema, char* value, int valuelen, char*
 
 // todo merge the error msg function with tSQLParser
 static void setErrMsg(char* msg, char* sql) {
-  char          msgFormat[] = "near \"%s\" syntax error";
+  const char*   msgFormat = "near \"%s\" syntax error";
   const int32_t BACKWARD_CHAR_STEP = 15;
 
   // only extract part of sql string,avoid too long sql string cause stack over flow

src/client/src/tscSQLParser.c

@@ -76,7 +76,7 @@ static int32_t insertResultField(SSqlCmd* pCmd, int32_t fieldIDInResult, SColumn
                                  int8_t type, char* fieldName);
 static int32_t changeFunctionID(int32_t optr, int16_t* pExpr);
 
-static void setErrMsg(SSqlCmd* pCmd, char* pzErrMsg, int32_t maxLen);
+static void setErrMsg(SSqlCmd* pCmd, const char* pzErrMsg);
 
 static int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMetric);
 
@@ -140,7 +140,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   SSqlCmd* pCmd = &(pSql->cmd);
 
   if (!pInfo->validSql) {
-    setErrMsg(pCmd, pInfo->pzErrMsg, tListLen(pInfo->pzErrMsg));
+    setErrMsg(pCmd, pInfo->pzErrMsg);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -153,13 +153,13 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     case DROP_USER:
     case DROP_ACCOUNT:
     case DROP_DATABASE: {
-      char msg[] = "param name too long";
-      char msg1[] = "invalid ip address";
-      char msg2[] = "invalid name";
+      const char* msg = "param name too long";
+      const char* msg1 = "invalid ip address";
+      const char* msg2 = "invalid name";
 
       SSQLToken* pzName = &pInfo->pDCLInfo->a[0];
       if ((pInfo->sqlType != DROP_DNODE) && (tscValidateName(pzName) != TSDB_CODE_SUCCESS)) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -171,7 +171,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
         int32_t code = setObjFullName(pCmd->name, getAccountId(pSql), pzName, NULL, NULL);
         if (code != TSDB_CODE_SUCCESS) {
-          setErrMsg(pCmd, msg2, tListLen(msg2));
+          setErrMsg(pCmd, msg2);
         }
 
         return code;
@@ -183,12 +183,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
         int32_t ret = setMeterID(pSql, pzName);
         if (ret != TSDB_CODE_SUCCESS) {
-          setErrMsg(pCmd, msg, tListLen(msg));
+          setErrMsg(pCmd, msg);
         }
         return ret;
       } else {
         if (pzName->n > TSDB_USER_LEN) {
-          setErrMsg(pCmd, msg, tListLen(msg));
+          setErrMsg(pCmd, msg);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -202,19 +202,19 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     case USE_DATABASE: {
-      char msg[] = "db name too long";
+      const char* msg = "db name too long";
       pCmd->command = TSDB_SQL_USE_DB;
 
       SSQLToken* pToken = &pInfo->pDCLInfo->a[0];
 	  
 	  if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-	  	char msg1[] = "invalid db name";
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+	  	const char* msg1 = "invalid db name";
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 	  
       if (pToken->n > TSDB_DB_NAME_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -247,8 +247,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     case ALTER_DATABASE:
     case CREATE_DATABASE: {
-      char    msg2[] = "name too long";
-      char    msg3[] = "invalid db name";
+      const char* msg2 = "name too long";
+      const char* msg3 = "invalid db name";
 
       if (pInfo->sqlType == ALTER_DATABASE) {
         pCmd->command = TSDB_SQL_ALTER_DB;
@@ -259,13 +259,13 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       SCreateDBInfo* pCreateDB = &(pInfo->pDCLInfo->dbOpt);
       if (tscValidateName(&pCreateDB->dbname) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg3, tListLen(msg3));
+        setErrMsg(pCmd, msg3);
         return TSDB_CODE_INVALID_SQL;
       }
 
       int32_t ret = setObjFullName(pCmd->name, getAccountId(pSql), &(pCreateDB->dbname), NULL, NULL);
       if (ret != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return ret;
       }
 
@@ -280,14 +280,14 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       pCmd->command = (pInfo->sqlType == CREATE_USER) ? TSDB_SQL_CREATE_USER : TSDB_SQL_CREATE_ACCT;
       assert(pInfo->pDCLInfo->nTokens >= 2);
 
-      char msg[] = "name or password too long";
-      char msg1[] = "password can not be empty";
-      char msg2[] = "invalid user/account name";
-      char msg3[] = "password needs single quote marks enclosed";
-      char msg4[] = "invalid state option, available options[no, r, w, all]";
+      const char* msg = "name or password too long";
+      const char* msg1 = "password can not be empty";
+      const char* msg2 = "invalid user/account name";
+      const char* msg3 = "password needs single quote marks enclosed";
+      const char* msg4 = "invalid state option, available options[no, r, w, all]";
 
       if (pInfo->pDCLInfo->a[1].type != TK_STRING) {
-        setErrMsg(pCmd, msg3, tListLen(msg3));
+        setErrMsg(pCmd, msg3);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -296,17 +296,17 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       pInfo->pDCLInfo->a[1].n = strlen(pInfo->pDCLInfo->a[1].z);
 
       if (pInfo->pDCLInfo->a[1].n <= 0) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (pInfo->pDCLInfo->a[0].n > TSDB_USER_LEN || pInfo->pDCLInfo->a[1].n > TSDB_PASSWORD_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (tscValidateName(&pInfo->pDCLInfo->a[0]) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -319,15 +319,15 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       int32_t num = pInfo->pDCLInfo->nTokens;
       assert(num >= 1 && num <= 2);
 
-      char msg[] = "password too long";
-      char msg1[] = "password can not be empty";
-      char msg2[] = "invalid user/account name";
-      char msg3[] = "password needs single quote marks enclosed";
-      char msg4[] = "invalid state option, available options[no, r, w, all]";
+      const char* msg = "password too long";
+      const char* msg1 = "password can not be empty";
+      const char* msg2 = "invalid user/account name";
+      const char* msg3 = "password needs single quote marks enclosed";
+      const char* msg4 = "invalid state option, available options[no, r, w, all]";
 
       if (num == 2) {
         if (pInfo->pDCLInfo->a[1].type != TK_STRING) {
-          setErrMsg(pCmd, msg3, tListLen(msg3));
+          setErrMsg(pCmd, msg3);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -336,12 +336,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
         pInfo->pDCLInfo->a[1].n = strlen(pInfo->pDCLInfo->a[1].z);
 
         if (pInfo->pDCLInfo->a[1].n <= 0) {
-          setErrMsg(pCmd, msg1, tListLen(msg1));
+          setErrMsg(pCmd, msg1);
           return TSDB_CODE_INVALID_SQL;
         }
 
         if (pInfo->pDCLInfo->a[1].n > TSDB_PASSWORD_LEN) {
-          setErrMsg(pCmd, msg, tListLen(msg));
+          setErrMsg(pCmd, msg);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -349,12 +349,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       }
 
       if (pInfo->pDCLInfo->a[0].n > TSDB_USER_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (tscValidateName(&pInfo->pDCLInfo->a[0]) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -385,7 +385,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
         } else if (strncmp(pAcctOpt->stat.z, "no", 2) == 0 && pAcctOpt->stat.n == 2) {
           pCmd->defaultVal[8] = 0;
         } else {
-          setErrMsg(pCmd, msg4, tListLen(msg4));
+          setErrMsg(pCmd, msg4);
           return TSDB_CODE_INVALID_SQL;
         }
       }
@@ -395,21 +395,21 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       pCmd->command = TSDB_SQL_DESCRIBE_TABLE;
 
       SSQLToken* pToken = &pInfo->pDCLInfo->a[0];
-      char       msg[] = "table name is too long";
+      const char* msg = "table name is too long";
 
 	  if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-	  	char msg1[] = "invalid table name";
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+	  	const char* msg1 = "invalid table name";
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 	  
       if (pToken->n > TSDB_METER_NAME_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (setMeterID(pSql, pToken) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -427,10 +427,10 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       tDCLSQL* pDCL = pInfo->pDCLInfo;
 
-      char msg[] = "parameters too long";
-      char msg1[] = "invalid ip address";
-      char msg2[] = "invalid configure options or values";
-      char msg3[] = "password can not be empty";
+      const char* msg = "parameters too long";
+      const char* msg1 = "invalid ip address";
+      const char* msg2 = "invalid configure options or values";
+      const char* msg3 = "password can not be empty";
 
       if (pInfo->sqlType != ALTER_DNODE) {
         strdequote(pDCL->a[1].z);
@@ -439,12 +439,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       }
 
       if (pDCL->a[1].n <= 0) {
-        setErrMsg(pCmd, msg3, tListLen(msg3));
+        setErrMsg(pCmd, msg3);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (pDCL->a[0].n > TSDB_METER_NAME_LEN || pDCL->a[1].n > TSDB_PASSWORD_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -454,7 +454,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
         /* validate the ip address */
         if (!validateIpAddress(ip)) {
-          setErrMsg(pCmd, msg1, tListLen(msg1));
+          setErrMsg(pCmd, msg1);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -462,7 +462,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
         /* validate the parameter names and options */
         if (validateDNodeConfig(pDCL) != TSDB_CODE_SUCCESS) {
-          setErrMsg(pCmd, msg2, tListLen(msg2));
+          setErrMsg(pCmd, msg2);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -473,8 +473,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
           strncpy(&pCmd->payload[pDCL->a[1].n + 1], pDCL->a[2].z, pDCL->a[2].n);
         }
       } else {
-        char msg[] = "invalid user rights";
-        char msg1[] = "password can not be empty or larger than 24 characters";
+        const char* msg = "invalid user rights";
+        const char* msg1 = "password can not be empty or larger than 24 characters";
 
         strncpy(pCmd->name, pDCL->a[0].z, pDCL->a[0].n);
 
@@ -487,7 +487,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
           if (pDCL->a[1].n <= 0 || pInfo->pDCLInfo->a[1].n > TSDB_PASSWORD_LEN) {
             /* password cannot be empty string */
-            setErrMsg(pCmd, msg1, tListLen(msg1));
+            setErrMsg(pCmd, msg1);
             return TSDB_CODE_INVALID_SQL;
           }
 
@@ -502,7 +502,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
           } else if (strncasecmp(pDCL->a[1].z, "write", 5) == 0 && pDCL->a[1].n == 5) {
             pCmd->count = 3;
           } else {
-            setErrMsg(pCmd, msg, tListLen(msg));
+            setErrMsg(pCmd, msg);
             return TSDB_CODE_INVALID_SQL;
           }
         } else {
@@ -513,9 +513,9 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     case ALTER_LOCAL: {
       pCmd->command = TSDB_SQL_CFG_LOCAL;
-      char msg[] = "parameter too long";
+      const char* msg = "parameter too long";
       if (pInfo->pDCLInfo->a[0].n > TSDB_METER_ID_LEN) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -524,8 +524,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     case TSQL_CREATE_NORMAL_METER:
     case TSQL_CREATE_NORMAL_METRIC: {
-      char msg[] = "table name too long";
-      char msg1[] = "invalid table name";
+      const char* msg = "table name too long";
+      const char* msg1 = "invalid table name";
 
       tFieldList* pFieldList = pInfo->pCreateTableInfo->colInfo.pColumns;
       tFieldList* pTagList = pInfo->pCreateTableInfo->colInfo.pTagColumns;
@@ -538,12 +538,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       SSQLToken* pzTableName = &(pInfo->pCreateTableInfo->name);
 
       if (tscValidateName(pzTableName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (setMeterID(pSql, pzTableName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -571,16 +571,16 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       pCmd->command = TSDB_SQL_CREATE_TABLE;
       pCmd->existsCheck = pInfo->pCreateTableInfo->existCheck;
 
-      char msg[] = "invalid table name";
-      char msg1[] = "illegal value or data overflow";
-      char msg2[] = "illegal number of tags";
+      const char* msg = "invalid table name";
+      const char* msg1 = "illegal value or data overflow";
+      const char* msg2 = "illegal number of tags";
 
       // table name
       // metric name, create table by using dst
       SSQLToken* pToken = &(pInfo->pCreateTableInfo->usingInfo.metricName);
 
 	  if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -601,7 +601,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       }
 
       if (pSql->cmd.pMeterMeta->numOfTags != pList->nExpr) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -612,7 +612,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       for (int32_t i = 0; i < pList->nExpr; ++i) {
         int32_t ret = tVariantDump(&(pList->a[i].pVar), tagVal, pTagSchema[i].type);
         if (ret != TSDB_CODE_SUCCESS) {
-          setErrMsg(pCmd, msg1, tListLen(msg1));
+          setErrMsg(pCmd, msg1);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -620,7 +620,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       }
 
       if (tscValidateName(&pInfo->pCreateTableInfo->name) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -635,26 +635,26 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     case TSQL_CREATE_STREAM: {
       pCmd->command = TSDB_SQL_CREATE_TABLE;
-      char msg[] = "table name too long";
-      char msg1[] = "invalid table name";
+      const char* msg = "table name too long";
+      const char* msg1 = "invalid table name";
 
       // if sql specifies db, use it, otherwise use default db
       SSQLToken* pzTableName = &(pInfo->pCreateTableInfo->name);
       SQuerySQL* pQuerySql = pInfo->pCreateTableInfo->pSelect;
 
       if (tscValidateName(pzTableName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
       SSQLToken* pSrcMeterName = &pInfo->pCreateTableInfo->pSelect->from;
       if (tscValidateName(pSrcMeterName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (setMeterID(pSql, pSrcMeterName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -689,7 +689,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       // set the created table[stream] name
       if (setMeterID(pSql, pzTableName) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -698,8 +698,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       strncpy(pCmd->payload, pQuerySql->selectToken.z, pQuerySql->selectToken.n);
       if (pQuerySql->selectToken.n > TSDB_MAX_SAVED_SQL_LEN) {
-        char msg4[] = "sql too long";  // todo ADD support
-        setErrMsg(pCmd, msg, tListLen(msg4));
+        const char* msg4 = "sql too long";  // todo ADD support
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -718,8 +718,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
        */
       if (pQuerySql->fillType != NULL) {
         if (pCmd->nAggTimeInterval == 0) {
-          char msg1[] = "fill only available for interval query";
-          setErrMsg(pCmd, msg1, tListLen(msg1));
+          const char* msg1 = "fill only available for interval query";
+          setErrMsg(pCmd, msg1);
 
           return TSDB_CODE_INVALID_SQL;
         }
@@ -728,8 +728,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
         if (pItem->pVar.nType == TSDB_DATA_TYPE_BINARY) {
           if (!((strncmp(pItem->pVar.pz, "none", 4) == 0 && pItem->pVar.nLen == 4) ||
                 (strncmp(pItem->pVar.pz, "null", 4) == 0 && pItem->pVar.nLen == 4))) {
-            char msg2[] = "fill option not supported in stream computing";
-            setErrMsg(pCmd, msg2, tListLen(msg2));
+            const char* msg2 = "fill option not supported in stream computing";
+            setErrMsg(pCmd, msg2);
 
             return TSDB_CODE_INVALID_SQL;
           }
@@ -745,20 +745,20 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       // too many result columns not support order by in query
       if (pQuerySql->pSelection->nExpr > TSDB_MAX_COLUMNS) {
-        char msg[] = "too many columns in selection clause";
-        setErrMsg(pCmd, msg, tListLen(msg));
+        const char* msg = "too many columns in selection clause";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
  
 	  if (tscValidateName(&(pQuerySql->from)) != TSDB_CODE_SUCCESS) {
-	  	char msg[] = "invalid table name";
-        setErrMsg(pCmd, msg, tListLen(msg));
+	  	const char* msg = "invalid table name";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 	  
       if (setMeterID(pSql, &pQuerySql->from) != TSDB_CODE_SUCCESS) {
-        char msg[] = "table name too long";
-        setErrMsg(pCmd, msg, tListLen(msg));
+        const char* msg = "table name too long";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -787,8 +787,8 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       SSQLToken* pSliding = &pQuerySql->sliding;
       if (pSliding->n != 0) {
         if (!tscEmbedded) {
-          char msg[] = "not support sliding in query";
-          setErrMsg(pCmd, msg, tListLen(msg));
+          const char* msg = "not support sliding in query";
+          setErrMsg(pCmd, msg);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -797,16 +797,16 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
           pCmd->nSlidingTime /= 1000;
         }
 
-        char msg3[] = "sliding value too small";
-        char msg4[] = "sliding value no larger than the interval value";
+        const char* msg3 = "sliding value too small";
+        const char* msg4 = "sliding value no larger than the interval value";
 
         if (pCmd->nSlidingTime < tsMinSlidingTime) {
-          setErrMsg(pCmd, msg3, tListLen(msg3));
+          setErrMsg(pCmd, msg3);
           return TSDB_CODE_INVALID_SQL;
         }
 
         if (pCmd->nSlidingTime > pCmd->nAggTimeInterval) {
-          setErrMsg(pCmd, msg4, tListLen(msg4));
+          setErrMsg(pCmd, msg4);
           return TSDB_CODE_INVALID_SQL;
         }
       }
@@ -843,17 +843,17 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       }
 
       if (!hasTimestampForPointInterpQuery(pCmd)) {
-        char msg[] = "point interpolation query needs timestamp";
-        setErrMsg(pCmd, msg, tListLen(msg));
+        const char* msg = "point interpolation query needs timestamp";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (pQuerySql->fillType != NULL) {
-        char msg1[] = "fill only available for interval query";
-        char msg2[] = "start(end) time of query range required or time range too large";
+        const char* msg1 = "fill only available for interval query";
+        const char* msg2 = "start(end) time of query range required or time range too large";
 
         if (pCmd->nAggTimeInterval == 0 && (!tscIsPointInterpQuery(pCmd))) {
-          setErrMsg(pCmd, msg1, tListLen(msg1));
+          setErrMsg(pCmd, msg1);
           return TSDB_CODE_INVALID_SQL;
         }
 
@@ -863,7 +863,7 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
           // TODO define macro
           if ((timeRange == 0) || (timeRange / pCmd->nAggTimeInterval) > 10000000) {
-            setErrMsg(pCmd, msg2, tListLen(msg2));
+            setErrMsg(pCmd, msg2);
             return TSDB_CODE_INVALID_SQL;
           }
         }
@@ -942,8 +942,8 @@ int32_t setIntervalClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql) {
 
   // interval cannot be less than 10 milliseconds
   if (pCmd->nAggTimeInterval < tsMinIntervalTime) {
-    char msg[] = "interval cannot be less than 10 ms";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "interval cannot be less than 10 ms";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -962,8 +962,8 @@ int32_t setIntervalClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql) {
 }
 
 int32_t setSlidingClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql) {
-  char msg0[] = "sliding value too small";
-  char msg1[] = "sliding value no larger than the interval value";
+  const char* msg0 = "sliding value too small";
+  const char* msg1 = "sliding value no larger than the interval value";
 
   SSQLToken* pSliding = &pQuerySql->sliding;
 
@@ -974,12 +974,12 @@ int32_t setSlidingClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql) {
     }
 
     if (pCmd->nSlidingTime < tsMinSlidingTime) {
-      setErrMsg(pCmd, msg0, tListLen(msg0));
+      setErrMsg(pCmd, msg0);
       return TSDB_CODE_INVALID_SQL;
     }
 
     if (pCmd->nSlidingTime > pCmd->nAggTimeInterval) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -993,7 +993,7 @@ int32_t setMeterID(SSqlObj *pSql, SSQLToken *pzTableName) {
 
   //clear array
   memset(pCmd->name, 0, tListLen(pCmd->name));
-  char msg[] = "name too long";
+  const char* msg = "name too long";
 
   if (hasSpecifyDB(pzTableName)) {
     /*
@@ -1010,7 +1010,7 @@ int32_t setMeterID(SSqlObj *pSql, SSQLToken *pzTableName) {
   }
 
   if (ret != TSDB_CODE_SUCCESS) {
-    setErrMsg(pCmd, msg, tListLen(msg));
+    setErrMsg(pCmd, msg);
   }
 
   return ret;
@@ -1019,23 +1019,23 @@ int32_t setMeterID(SSqlObj *pSql, SSQLToken *pzTableName) {
 static bool validateTableColumnInfo(tFieldList* pFieldList, SSqlCmd* pCmd) {
   assert(pFieldList != NULL);
 
-  char msg[] = "illegal number of columns";
-  char msg1[] = "first column must be timestamp";
-  char msg2[] = "row length exceeds max length";
-  char msg3[] = "duplicated column names";
-  char msg4[] = "invalid data types";
-  char msg5[] = "invalid binary/nchar column length";
-  char msg6[] = "invalid column name";
+  const char* msg = "illegal number of columns";
+  const char* msg1 = "first column must be timestamp";
+  const char* msg2 = "row length exceeds max length";
+  const char* msg3 = "duplicated column names";
+  const char* msg4 = "invalid data types";
+  const char* msg5 = "invalid binary/nchar column length";
+  const char* msg6 = "invalid column name";
 
   // number of fields no less than 2
   if (pFieldList->nField <= 1 || pFieldList->nField > TSDB_MAX_COLUMNS) {
-    setErrMsg(pCmd, msg, tListLen(msg));
+    setErrMsg(pCmd, msg);
     return false;
   }
 
   // first column must be timestamp
   if (pFieldList->p[0].type != TSDB_DATA_TYPE_TIMESTAMP) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return false;
   }
 
@@ -1046,7 +1046,7 @@ static bool validateTableColumnInfo(tFieldList* pFieldList, SSqlCmd* pCmd) {
 
   // max row length must be less than TSDB_MAX_BYTES_PER_ROW
   if (nLen > TSDB_MAX_BYTES_PER_ROW) {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return false;
   }
 
@@ -1054,23 +1054,23 @@ static bool validateTableColumnInfo(tFieldList* pFieldList, SSqlCmd* pCmd) {
   for (int32_t i = 0; i < pFieldList->nField; ++i) {
     TAOS_FIELD* pField = &pFieldList->p[i];
     if (pField->type < TSDB_DATA_TYPE_BOOL || pField->type > TSDB_DATA_TYPE_NCHAR) {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return false;
     }
 
     if ((pField->type == TSDB_DATA_TYPE_BINARY && (pField->bytes <= 0 || pField->bytes > TSDB_MAX_BINARY_LEN)) ||
         (pField->type == TSDB_DATA_TYPE_NCHAR && (pField->bytes <= 0 || pField->bytes > TSDB_MAX_NCHAR_LEN))) {
-      setErrMsg(pCmd, msg5, tListLen(msg5));
+      setErrMsg(pCmd, msg5);
       return false;
     }
 
     if (validateColumnName(pField->name) != TSDB_CODE_SUCCESS) {
-      setErrMsg(pCmd, msg6, tListLen(msg6));
+      setErrMsg(pCmd, msg6);
       return false;
     }
 
     if (has(pFieldList, i + 1, pFieldList->p[i].name) == true) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return false;
     }
   }
@@ -1081,17 +1081,17 @@ static bool validateTableColumnInfo(tFieldList* pFieldList, SSqlCmd* pCmd) {
 static bool validateTagParams(tFieldList* pTagsList, tFieldList* pFieldList, SSqlCmd* pCmd) {
   assert(pTagsList != NULL);
 
-  char msg1[] = "invalid number of tag columns";
-  char msg2[] = "tag length too long";
-  char msg3[] = "duplicated column names";
-  char msg4[] = "timestamp not allowed in tags";
-  char msg5[] = "invalid data type in tags";
-  char msg6[] = "invalid tag name";
-  char msg7[] = "invalid binary/nchar tag length";
+  const char* msg1 = "invalid number of tag columns";
+  const char* msg2 = "tag length too long";
+  const char* msg3 = "duplicated column names";
+  const char* msg4 = "timestamp not allowed in tags";
+  const char* msg5 = "invalid data type in tags";
+  const char* msg6 = "invalid tag name";
+  const char* msg7 = "invalid binary/nchar tag length";
 
   // number of fields at least 1
   if (pTagsList->nField < 1 || pTagsList->nField > TSDB_MAX_TAGS) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return false;
   }
 
@@ -1102,14 +1102,14 @@ static bool validateTagParams(tFieldList* pTagsList, tFieldList* pFieldList, SSq
 
   // max tag row length must be less than TSDB_MAX_TAGS_LEN
   if (nLen > TSDB_MAX_TAGS_LEN) {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return false;
   }
 
   // field name must be unique
   for (int32_t i = 0; i < pTagsList->nField; ++i) {
     if (has(pFieldList, 0, pTagsList->p[i].name) == true) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return false;
     }
   }
@@ -1117,28 +1117,28 @@ static bool validateTagParams(tFieldList* pTagsList, tFieldList* pFieldList, SSq
   /* timestamp in tag is not allowed */
   for (int32_t i = 0; i < pTagsList->nField; ++i) {
     if (pTagsList->p[i].type == TSDB_DATA_TYPE_TIMESTAMP) {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return false;
     }
 
     if (pTagsList->p[i].type < TSDB_DATA_TYPE_BOOL || pTagsList->p[i].type > TSDB_DATA_TYPE_NCHAR) {
-      setErrMsg(pCmd, msg5, tListLen(msg5));
+      setErrMsg(pCmd, msg5);
       return false;
     }
 
     if ((pTagsList->p[i].type == TSDB_DATA_TYPE_BINARY && pTagsList->p[i].bytes <= 0) ||
         (pTagsList->p[i].type == TSDB_DATA_TYPE_NCHAR && pTagsList->p[i].bytes <= 0)) {
-      setErrMsg(pCmd, msg7, tListLen(msg7));
+      setErrMsg(pCmd, msg7);
       return false;
     }
 
     if (validateColumnName(pTagsList->p[i].name) != TSDB_CODE_SUCCESS) {
-      setErrMsg(pCmd, msg6, tListLen(msg6));
+      setErrMsg(pCmd, msg6);
       return false;
     }
 
     if (has(pTagsList, i + 1, pTagsList->p[i].name) == true) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return false;
     }
   }
@@ -1150,12 +1150,12 @@ static bool validateTagParams(tFieldList* pTagsList, tFieldList* pFieldList, SSq
  * tags name /column name is truncated in sql.y
  */
 bool validateOneTags(SSqlCmd* pCmd, TAOS_FIELD* pTagField) {
-  char msg1[] = "timestamp not allowed in tags";
-  char msg2[] = "duplicated column names";
-  char msg3[] = "tag length too long";
-  char msg4[] = "invalid tag name";
-  char msg5[] = "invalid binary/nchar tag length";
-  char msg6[] = "invalid data type in tags";
+  const char* msg1 = "timestamp not allowed in tags";
+  const char* msg2 = "duplicated column names";
+  const char* msg3 = "tag length too long";
+  const char* msg4 = "invalid tag name";
+  const char* msg5 = "invalid binary/nchar tag length";
+  const char* msg6 = "invalid data type in tags";
 
   SMeterMeta* pMeterMeta = pCmd->pMeterMeta;
 
@@ -1164,18 +1164,18 @@ bool validateOneTags(SSqlCmd* pCmd, TAOS_FIELD* pTagField) {
     char msg[128] = {0};
     sprintf(msg, "tags no more than %d", TSDB_MAX_TAGS);
 
-    setErrMsg(pCmd, msg, strlen(msg));
+    setErrMsg(pCmd, msg);
     return false;
   }
 
   // no timestamp allowable
   if (pTagField->type == TSDB_DATA_TYPE_TIMESTAMP) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return false;
   }
 
   if (pTagField->type < TSDB_DATA_TYPE_BOOL && pTagField->type > TSDB_DATA_TYPE_NCHAR) {
-    setErrMsg(pCmd, msg6, tListLen(msg6));
+    setErrMsg(pCmd, msg6);
     return false;
   }
 
@@ -1188,19 +1188,19 @@ bool validateOneTags(SSqlCmd* pCmd, TAOS_FIELD* pTagField) {
 
   // length less than TSDB_MAX_TASG_LEN
   if (nLen + pTagField->bytes > TSDB_MAX_TAGS_LEN) {
-    setErrMsg(pCmd, msg3, tListLen(msg3));
+    setErrMsg(pCmd, msg3);
     return false;
   }
 
   // tags name can not be a keyword
   if (validateColumnName(pTagField->name) != TSDB_CODE_SUCCESS) {
-    setErrMsg(pCmd, msg4, tListLen(msg4));
+    setErrMsg(pCmd, msg4);
     return false;
   }
 
   // binary(val), val can not be equalled to or less than 0
   if ((pTagField->type == TSDB_DATA_TYPE_BINARY || pTagField->type == TSDB_DATA_TYPE_NCHAR) && pTagField->bytes <= 0) {
-    setErrMsg(pCmd, msg5, tListLen(msg5));
+    setErrMsg(pCmd, msg5);
     return false;
   }
 
@@ -1209,7 +1209,7 @@ bool validateOneTags(SSqlCmd* pCmd, TAOS_FIELD* pTagField) {
 
   for (int32_t i = 0; i < pMeterMeta->numOfTags + pMeterMeta->numOfColumns; ++i) {
     if (strncasecmp(pTagField->name, pSchema[i].name, TSDB_COL_NAME_LEN) == 0) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return false;
     }
   }
@@ -1218,29 +1218,29 @@ bool validateOneTags(SSqlCmd* pCmd, TAOS_FIELD* pTagField) {
 }
 
 bool validateOneColumn(SSqlCmd* pCmd, TAOS_FIELD* pColField) {
-  char msg1[] = "too many columns";
-  char msg2[] = "duplicated column names";
-  char msg3[] = "column length too long";
-  char msg4[] = "invalid data types";
-  char msg5[] = "invalid column name";
-  char msg6[] = "invalid column length";
+  const char* msg1 = "too many columns";
+  const char* msg2 = "duplicated column names";
+  const char* msg3 = "column length too long";
+  const char* msg4 = "invalid data types";
+  const char* msg5 = "invalid column name";
+  const char* msg6 = "invalid column length";
 
   SMeterMeta* pMeterMeta = pCmd->pMeterMeta;
 
   // no more max columns
   if (pMeterMeta->numOfColumns >= TSDB_MAX_COLUMNS ||
       pMeterMeta->numOfTags + pMeterMeta->numOfColumns >= TSDB_MAX_COLUMNS) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return false;
   }
 
   if (pColField->type < TSDB_DATA_TYPE_BOOL || pColField->type > TSDB_DATA_TYPE_NCHAR) {
-    setErrMsg(pCmd, msg4, tListLen(msg4));
+    setErrMsg(pCmd, msg4);
     return false;
   }
 
   if (validateColumnName(pColField->name) != TSDB_CODE_SUCCESS) {
-    setErrMsg(pCmd, msg5, tListLen(msg5));
+    setErrMsg(pCmd, msg5);
     return false;
   }
 
@@ -1252,20 +1252,20 @@ bool validateOneColumn(SSqlCmd* pCmd, TAOS_FIELD* pColField) {
   }
 
   if (pColField->bytes <= 0) {
-    setErrMsg(pCmd, msg6, tListLen(msg6));
+    setErrMsg(pCmd, msg6);
     return false;
   }
 
   // length less than TSDB_MAX_BYTES_PER_ROW
   if (nLen + pColField->bytes > TSDB_MAX_BYTES_PER_ROW) {
-    setErrMsg(pCmd, msg3, tListLen(msg3));
+    setErrMsg(pCmd, msg3);
     return false;
   }
 
   // field name must be unique
   for (int32_t i = 0; i < pMeterMeta->numOfTags + pMeterMeta->numOfColumns; ++i) {
     if (strncasecmp(pColField->name, pSchema[i].name, TSDB_COL_NAME_LEN) == 0) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return false;
     }
   }
@@ -1366,10 +1366,10 @@ static void extractColumnNameFromString(tSQLExprItem* pItem, char* tmpBuf) {
 int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMetric) {
   assert(pSelection != NULL && pCmd != NULL);
 
-  char msg1[] = "invalid column name/illegal column type in arithmetic expression";
-  char msg2[] = "functions can not be mixed up";
-  char msg3[] = "not support query expression";
-  char msg4[] = "function not support in STable query";
+  const char* msg1 = "invalid column name/illegal column type in arithmetic expression";
+  const char* msg2 = "functions can not be mixed up";
+  const char* msg3 = "not support query expression";
+  const char* msg4 = "function not support in STable query";
 
   SSchema* pSchema = tsGetSchema(pCmd->pMeterMeta);
 
@@ -1406,7 +1406,7 @@ int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMet
       /* arithmetic function in select*/
       int32_t ret = validateArithmeticSQLExpr(pItem->pNode, pSchema, pCmd->pMeterMeta->numOfColumns);
       if (ret != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -1441,7 +1441,7 @@ int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMet
        * not support such expression
        * e.g., select 12+5 from table_name
        */
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -1451,7 +1451,7 @@ int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMet
   }
 
   if (!functionCompatibleCheck(pCmd)) {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -1470,7 +1470,7 @@ int32_t buildSelectionClause(SSqlCmd* pCmd, tSQLExprList* pSelection, bool isMet
     tscTansformSQLFunctionForMetricQuery(pCmd);
 
     if (hasUnsupportFunctionsForMetricQuery(pCmd)) {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -1578,8 +1578,8 @@ int32_t addProjectionExprAndResultField(SSqlCmd* pCmd, SSchema* pSchema, tSQLExp
         addRequiredTagColumn(pCmd, -1);
         pExpr->colInfo.isTag = true;
       } else {
-        char msg[] = "invalid column name";
-        setErrMsg(pCmd, msg, tListLen(msg));
+        const char* msg = "invalid column name";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
     } else {
@@ -1611,12 +1611,12 @@ static int32_t setExprInfoForFunctions(SSqlCmd* pCmd, SSchema* pSchema, int32_t
   int16_t bytes = 0;
 
   char columnName[TSDB_COL_NAME_LEN] = {0};
-  char msg1[] = "not support column types";
+  const char* msg1 = "not support column types";
 
   if (functionID == TSDB_FUNC_SPREAD) {
     if (pSchema[idx].type == TSDB_DATA_TYPE_BINARY || pSchema[idx].type == TSDB_DATA_TYPE_NCHAR ||
         pSchema[idx].type == TSDB_DATA_TYPE_BOOL) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return -1;
     } else {
       type = TSDB_DATA_TYPE_DOUBLE;
@@ -1652,16 +1652,16 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
   SSchema* pSchema = tsGetSchema(pCmd->pMeterMeta);
   int32_t  numOfAddedColumn = 1;
 
-  char msg[] = "invalid parameters";
-  char msg1[] = "not support column types";
-  char msg3[] = "illegal column name";
-  char msg5[] = "parameter is out of range [0, 100]";
+  const char* msg = "invalid parameters";
+  const char* msg1 = "not support column types";
+  const char* msg3 = "illegal column name";
+  const char* msg5 = "parameter is out of range [0, 100]";
 
   switch (optr) {
     case TK_COUNT: {
       if (pItem->pNode->pParam != NULL && pItem->pNode->pParam->nExpr != 1) {
         /* more than one parameter for count() function */
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return -1;
       }
 
@@ -1675,7 +1675,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
       if (pItem->pNode->pParam != NULL) {
         SSQLToken* pToken = &pItem->pNode->pParam->a[0].pNode->colInfo;
         if (pToken->z == NULL || pToken->n == 0) {
-          setErrMsg(pCmd, msg3, tListLen(msg3));
+          setErrMsg(pCmd, msg3);
           return -1;
         }
 
@@ -1686,7 +1686,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
         } else {
           columnId = getColumnIndexByName(pToken, pSchema, pCmd->pMeterMeta->numOfColumns);
           if (columnId < 0) {  // invalid column name
-            setErrMsg(pCmd, msg3, tListLen(msg3));
+            setErrMsg(pCmd, msg3);
             return -1;
           }
 
@@ -1719,26 +1719,26 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
       if (pItem->pNode->pParam == NULL || (optr != TK_LEASTSQUARES && pItem->pNode->pParam->nExpr != 1) ||
           (optr == TK_LEASTSQUARES && pItem->pNode->pParam->nExpr != 3)) {
         /* no parameters or more than one parameter for function */
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return -1;
       }
 
       tSQLExprItem* pParamElem = &(pItem->pNode->pParam->a[0]);
       if (pParamElem->pNode->nSQLOptr != TK_ALL && pParamElem->pNode->nSQLOptr != TK_ID) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return -1;
       }
 
       int32_t idx = getColumnIndexByName(&pParamElem->pNode->colInfo, pSchema, pCmd->pMeterMeta->numOfColumns);
       if (idx < 0) {  // invalid column name
-        setErrMsg(pCmd, msg3, tListLen(msg3));
+        setErrMsg(pCmd, msg3);
         return -1;
       }
 
       // 2. check if sql function can be applied on this column data type
       int16_t colType = pSchema[idx].type;
       if (colType == TSDB_DATA_TYPE_BOOL || colType >= TSDB_DATA_TYPE_BINARY) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return -1;
       }
 
@@ -1800,7 +1800,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
 
       if (!requireAllFields) {
         if (pItem->pNode->pParam->nExpr < 1) {
-          setErrMsg(pCmd, msg3, tListLen(msg3));
+          setErrMsg(pCmd, msg3);
           return -1;
         }
 
@@ -1809,7 +1809,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
         for (int32_t i = 0; i < pItem->pNode->pParam->nExpr; ++i) {
           tSQLExprItem* pParamElem = &(pItem->pNode->pParam->a[i]);
           if (pParamElem->pNode->nSQLOptr != TK_ALL && pParamElem->pNode->nSQLOptr != TK_ID) {
-            setErrMsg(pCmd, msg3, tListLen(msg3));
+            setErrMsg(pCmd, msg3);
             return -1;
           }
 
@@ -1841,13 +1841,13 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
       // 1. valid the number of parameters
       if (pItem->pNode->pParam == NULL || pItem->pNode->pParam->nExpr != 2) {
         /* no parameters or more than one parameter for function */
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return -1;
       }
 
       tSQLExprItem* pParamElem = &(pItem->pNode->pParam->a[0]);
       if (pParamElem->pNode->nSQLOptr != TK_ID) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
       }
 
       char columnName[TSDB_COL_NAME_LEN] = {0};
@@ -1861,13 +1861,13 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
       // 2. valid the column type
       int16_t colType = pSchema[idx].type;
       if (colType == TSDB_DATA_TYPE_BOOL || colType >= TSDB_DATA_TYPE_BINARY) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return -1;
       }
 
       // 3. valid the parameters
       if (pParamElem[1].pNode->nSQLOptr == TK_ID) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return -1;
       }
 
@@ -1882,7 +1882,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, int32_t colIdx, tSQLExprItem* pItem
 
         double dp = *((double*)val);
         if (dp < 0 || dp > 100) {  // todo use macro
-          setErrMsg(pCmd, msg5, tListLen(msg5));
+          setErrMsg(pCmd, msg5);
           return -1;
         }
 
@@ -2038,9 +2038,9 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   pCmd->command = TSDB_SQL_SHOW;
   int8_t type = pInfo->sqlType;
 
-  char msg[] = "database name too long";
-  char msg1[] = "invalid database name";
-  char msg2[] = "pattern filter string too long";
+  const char* msg = "database name too long";
+  const char* msg1 = "invalid database name";
+  const char* msg2 = "pattern filter string too long";
 
   switch (type) {
     case SHOW_VGROUPS:
@@ -2085,12 +2085,12 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       SSQLToken* pDbPrefixToken = &pInfo->pDCLInfo->a[0];
 
       if (pDbPrefixToken->n > TSDB_DB_NAME_LEN) {  // db name is too long
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
       if (pDbPrefixToken->n > 0 && tscValidateName(pDbPrefixToken) != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -2117,7 +2117,7 @@ int32_t setShowInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
         pCmd->payloadLen = strlen(pCmd->payload);
 
         if (pCmd->payloadLen > TSDB_METER_NAME_LEN) {
-          setErrMsg(pCmd, msg2, tListLen(msg2));
+          setErrMsg(pCmd, msg2);
           return TSDB_CODE_INVALID_SQL;  // wildcard is too long
         }
       }
@@ -2158,8 +2158,8 @@ int32_t setKillInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   if (!validateIpAddress(ipStr)) {
     memset(pCmd->payload, 0, tListLen(pCmd->payload));
 
-    char msg[] = "invalid ip address";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "invalid ip address";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -2167,18 +2167,17 @@ int32_t setKillInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   if (port <= 0 || port > 65535) {
     memset(pCmd->payload, 0, tListLen(pCmd->payload));
 
-    char msg[] = "invalid port";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "invalid port";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
   return TSDB_CODE_SUCCESS;
 }
 
-void setErrMsg(SSqlCmd* pCmd, char* pzErrMsg, int32_t maxLen) {
-  int32_t validLen = (maxLen > pCmd->allocSize) ? pCmd->allocSize : maxLen;
-  strncpy(pCmd->payload, pzErrMsg, validLen);
-  pCmd->payload[validLen - 1] = 0;
+void setErrMsg(SSqlCmd* pCmd, const char* pzErrMsg) {
+  strncpy(pCmd->payload, pzErrMsg, pCmd->allocSize);
+  pCmd->payload[pCmd->allocSize - 1] = 0;
 }
 
 bool validateIpAddress(char* ip) {
@@ -2306,16 +2305,16 @@ void updateTagColumnIndex(SSqlCmd* pCmd) {
 }
 
 int32_t setGroupByClause(SSqlCmd* pCmd, tVariantList* pList) {
-  char msg1[] = "too many columns in group by clause";
-  char msg2[] = "invalid column name in group by clause";
-  char msg3[] = "functions are not available in group by query";
-  char msg4[] = "group by only available for STable query";
+  const char* msg1 = "too many columns in group by clause";
+  const char* msg2 = "invalid column name in group by clause";
+  const char* msg3 = "functions are not available in group by query";
+  const char* msg4 = "group by only available for STable query";
 
   if (UTIL_METER_IS_NOMRAL_METER(pCmd)) {
     if (pList == NULL) {
       return TSDB_CODE_SUCCESS;
     } else {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -2326,7 +2325,7 @@ int32_t setGroupByClause(SSqlCmd* pCmd, tVariantList* pList) {
 
   pCmd->groupbyExpr.numOfGroupbyCols = pList->nExpr;
   if (pList->nExpr > TSDB_MAX_TAGS) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -2353,7 +2352,7 @@ int32_t setGroupByClause(SSqlCmd* pCmd, tVariantList* pList) {
     } else {
       colIdx = getColumnIndexByName(&token, pSchema, pMeterMeta->numOfTags + pMeterMeta->numOfColumns);
       if (colIdx < pMeterMeta->numOfColumns || colIdx > TSDB_MAX_TAGS + pMeterMeta->numOfColumns) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -2391,12 +2390,12 @@ int32_t setGroupByClause(SSqlCmd* pCmd, tVariantList* pList) {
     int32_t functId = tscSqlExprGet(pCmd, i)->sqlFuncId;
     if (IS_MULTIOUTPUT(aAggs[functId].nStatus) && functId != TSDB_FUNC_TOP_DST && functId != TSDB_FUNC_BOTTOM_DST &&
         functId != TSDB_FUNC_TOP && functId != TSDB_FUNC_BOTTOM) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
 
     if (functId == TSDB_FUNC_COUNT && tscSqlExprGet(pCmd, i)->colInfo.colIdx == -1) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -2592,15 +2591,15 @@ static int32_t buildTagQueryCondString(SSqlCmd* pCmd, tSQLExpr* pExpr, char** qu
   tSQLExpr* pLeft = pExpr->pLeft;
   tSQLExpr* pRight = pExpr->pRight;
 
-  char      msg0[] = "invalid table name list";
-  char      msg1[] = "like operation is not allowed on numeric tags";
-  char      msg2[] = "in and query condition cannot be mixed up";
+  const char* msg0 = "invalid table name list";
+  const char* msg1 = "like operation is not allowed on numeric tags";
+  const char* msg2 = "in and query condition cannot be mixed up";
   STagCond* pCond = &pCmd->tagCond;
 
   if (pExpr->nSQLOptr == TK_IN && pRight->nSQLOptr == TK_SET) {
     /* table name array list, invoke another routine */
     if (pCond->type == TSQL_STABLE_QTYPE_COND) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -2612,14 +2611,14 @@ static int32_t buildTagQueryCondString(SSqlCmd* pCmd, tSQLExpr* pExpr, char** qu
 
     int32_t ret = createTableNameList(pRight, queryStr);
     if (ret != TSDB_CODE_SUCCESS) {
-      setErrMsg(pCmd, msg0, tListLen(msg0));
+      setErrMsg(pCmd, msg0);
     }
     return ret;
   }
 
   // already use IN predicates
   if (pCond->type == TSQL_STABLE_QTYPE_SET) {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return TSDB_CODE_INVALID_SQL;
   } else {
     pCond->type = TSQL_STABLE_QTYPE_COND;
@@ -2647,7 +2646,7 @@ static int32_t buildTagQueryCondString(SSqlCmd* pCmd, tSQLExpr* pExpr, char** qu
     int32_t colIdx = getColumnIndexByName(&pLeft->colInfo, pSchema, numOfCols + numOfTags);
     if ((!isTbnameToken(&pLeft->colInfo)) && pSchema[colIdx].type != TSDB_DATA_TYPE_BINARY &&
         pSchema[colIdx].type != TSDB_DATA_TYPE_NCHAR) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -2781,18 +2780,18 @@ static int32_t getColumnFilterInfo(SSqlCmd* pCmd, int32_t colIdx, tSQLExpr* pExp
   SMeterMeta* pMeterMeta = pCmd->pMeterMeta;
   SSchema*    pSchema = tsGetSchema(pMeterMeta);
 
-  char msg[] = "nchar column not available for filter";
-  char msg1[] = "non binary column not support like operator";
-  char msg2[] = "binary column not support this operator";
-  char msg3[] = "column not support in operator";
+  const char* msg = "nchar column not available for filter";
+  const char* msg1 = "non binary column not support like operator";
+  const char* msg2 = "binary column not support this operator";
+  const char* msg3 = "column not support in operator";
 
   if (pSchema[colIdx].type == TSDB_DATA_TYPE_NCHAR) {
-    setErrMsg(pCmd, msg, tListLen(msg));
+    setErrMsg(pCmd, msg);
     return -1;
   }
 
   if (pExpr->nSQLOptr == TK_IN) {
-    setErrMsg(pCmd, msg3, tListLen(msg3));
+    setErrMsg(pCmd, msg3);
     return -1;
   }
 
@@ -2802,12 +2801,12 @@ static int32_t getColumnFilterInfo(SSqlCmd* pCmd, int32_t colIdx, tSQLExpr* pExp
 
   if (pColFilter->filterOnBinary) {
     if (pExpr->nSQLOptr != TK_EQ && pExpr->nSQLOptr != TK_NE && pExpr->nSQLOptr != TK_LIKE) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
   } else {
     if (pExpr->nSQLOptr == TK_LIKE) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -2827,27 +2826,27 @@ static int32_t handleExprInQueryCond(SSqlCmd* pCmd, bool* queryTimeRangeIsSet, c
   int32_t numOfCols = pMeterMeta->numOfColumns;
   int32_t numOfTags = pMeterMeta->numOfTags;
 
-  char msg[] = "meter query cannot use tags filter";
-  char msg1[] = "illegal column name";
-  char msg2[] = "invalid timestamp";
+  const char* msg = "meter query cannot use tags filter";
+  const char* msg1 = "illegal column name";
+  const char* msg2 = "invalid timestamp";
 
   int32_t colIdx = getColumnIndexByName(&pLeft->colInfo, pSchema, numOfCols + numOfTags);
   bool    istbname = isTbnameToken(&pLeft->colInfo);
 
   if (colIdx < 0 && (!istbname)) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return TSDB_CODE_INVALID_SQL;
   }
 
   if (colIdx == 0) {  // query on time range
     *queryTimeRangeIsSet = true;
     if (getTimeRange(stime, etime, pRight, pExpr->nSQLOptr, pMeterMeta->precision) != TSDB_CODE_SUCCESS) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
   } else if (colIdx >= numOfCols || istbname) {  // query on tags
     if (UTIL_METER_IS_NOMRAL_METER(pCmd)) {
-      setErrMsg(pCmd, msg, tListLen(msg));
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
     return buildTagQueryCondString(pCmd, pExpr, queryStr);
@@ -2939,8 +2938,8 @@ int32_t getQueryCondExprImpl(SSqlCmd* pCmd, tSQLExpr* pExpr, int64_t* stime, int
         *etime = etime2 < (*etime) ? etime2 : (*etime);
 
       } else {
-        char msg1[] = "not support multi-segments query time ranges";
-        setErrMsg(pCmd, msg1, tListLen(msg1));
+        const char* msg1 = "not support multi-segments query time ranges";
+        setErrMsg(pCmd, msg1);
         return TSDB_CODE_INVALID_SQL;
       }
     }
@@ -3024,7 +3023,7 @@ int tableNameCompar(const void* lhs, const void* rhs) {
 
 static int32_t setMetersIDForMetricQuery(SSqlObj* pSql, char* tmpTagCondBuf) {
   SSqlCmd* pCmd = &pSql->cmd;
-  char     msg[] = "meter name too long";
+  const char* msg = "meter name too long";
 
   pCmd->tagCond.allocSize = 4096;
   pCmd->tagCond.pData = realloc(pCmd->tagCond.pData, pCmd->tagCond.allocSize);
@@ -3067,7 +3066,7 @@ static int32_t setMetersIDForMetricQuery(SSqlObj* pSql, char* tmpTagCondBuf) {
     int32_t   ret = setObjFullName(pCmd->tagCond.pData + pCmd->tagCond.len, acc, &tDB, &t, &xlen);
 
     if (ret != TSDB_CODE_SUCCESS) {
-      setErrMsg(pCmd, msg, tListLen(msg));
+      setErrMsg(pCmd, msg);
       tfree(segments);
       return ret;
     }
@@ -3109,14 +3108,14 @@ int32_t buildQueryCond(SSqlObj* pSql, tSQLExpr* pExpr) {
     return TSDB_CODE_SUCCESS;
   }
 
-  char msg1[] = "invalid expression";
-  char msg2[] = "meter is not allowed";
-  char msg3[] = "invalid filter expression";
+  const char* msg1 = "invalid expression";
+  const char* msg2 = "meter is not allowed";
+  const char* msg3 = "invalid filter expression";
 
   tSQLExpr* pLeft = pExpr->pLeft;
   tSQLExpr* pRight = pExpr->pRight;
   if (pLeft == NULL || pRight == NULL || (pLeft->nSQLOptr == TK_ID && pRight->nSQLOptr == TK_ID)) {
-    setErrMsg(pCmd, msg1, tListLen(msg1));
+    setErrMsg(pCmd, msg1);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3142,7 +3141,7 @@ int32_t buildQueryCond(SSqlObj* pSql, tSQLExpr* pExpr) {
 
     if (pCmd->tagCond.type == TSQL_STABLE_QTYPE_SET) {
       if (!UTIL_METER_IS_METRIC(pCmd)) {
-        setErrMsg(pCmd, msg2, tListLen(msg2));
+        setErrMsg(pCmd, msg2);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -3161,7 +3160,7 @@ int32_t buildQueryCond(SSqlObj* pSql, tSQLExpr* pExpr) {
   }
 
   if (!validateFilterExpr(pCmd)) {
-    setErrMsg(pCmd, msg3, tListLen(msg3));
+    setErrMsg(pCmd, msg3);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3257,8 +3256,8 @@ int32_t tsRewriteFieldNameIfNecessary(SSqlCmd* pCmd) {
     char* fieldName = tscFieldInfoGetField(pCmd, i)->name;
     for (int32_t j = i + 1; j < pCmd->fieldsInfo.numOfOutputCols; ++j) {
       if (strncasecmp(fieldName, tscFieldInfoGetField(pCmd, j)->name, TSDB_COL_NAME_LEN) == 0) {
-        char msg[] = "duplicated column name in new table";
-        setErrMsg(pCmd, msg, tListLen(msg));
+        const char* msg = "duplicated column name in new table";
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
     }
@@ -3272,12 +3271,12 @@ int32_t setFillPolicy(SSqlCmd* pCmd, SQuerySQL* pQuerySQL) {
   tVariantListItem* pItem = &pFillToken->a[0];
 
   const int32_t START_INTERPO_COL_IDX = 1;
-  char          msg[] = "illegal value or data overflow";
-  char          msg1[] = "value is expected";
-  char          msg2[] = "invalid fill option";
+  const char* msg = "illegal value or data overflow";
+  const char* msg1 = "value is expected";
+  const char* msg2 = "invalid fill option";
 
   if (pItem->pVar.nType != TSDB_DATA_TYPE_BINARY) {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3298,7 +3297,7 @@ int32_t setFillPolicy(SSqlCmd* pCmd, SQuerySQL* pQuerySQL) {
     pCmd->interpoType = TSDB_INTERPO_SET_VALUE;
 
     if (pFillToken->nExpr == 1) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3324,7 +3323,7 @@ int32_t setFillPolicy(SSqlCmd* pCmd, SQuerySQL* pQuerySQL) {
 
       int32_t ret = tVariantDump(&pFillToken->a[j].pVar, (char*)&pCmd->defaultVal[i], pFields->type);
       if (ret != TSDB_CODE_SUCCESS) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -3347,7 +3346,7 @@ int32_t setFillPolicy(SSqlCmd* pCmd, SQuerySQL* pQuerySQL) {
       }
     }
   } else {
-    setErrMsg(pCmd, msg2, tListLen(msg2));
+    setErrMsg(pCmd, msg2);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3372,10 +3371,10 @@ static void setDefaultOrderInfo(SSqlCmd* pCmd) {
 }
 
 int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema, int32_t numOfCols) {
-  char msg[] = "only support order by primary timestamp";
-  char msg3[] = "invalid column name";
-  char msg5[] = "only support order by primary timestamp and queried column";
-  char msg6[] = "only support order by primary timestamp and first tag in groupby clause";
+  const char* msg = "only support order by primary timestamp";
+  const char* msg3 = "invalid column name";
+  const char* msg5 = "only support order by primary timestamp and queried column";
+  const char* msg6 = "only support order by primary timestamp and first tag in groupby clause";
 
   setDefaultOrderInfo(pCmd);
 
@@ -3386,12 +3385,12 @@ int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema,
   tVariantList* pSortorder = pQuerySql->pSortOrder;
   if (UTIL_METER_IS_NOMRAL_METER(pCmd)) {
     if (pSortorder->nExpr > 1) {
-      setErrMsg(pCmd, msg, tListLen(msg));
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
   } else {
     if (pSortorder->nExpr > 2) {
-      setErrMsg(pCmd, msg6, tListLen(msg6));
+      setErrMsg(pCmd, msg6);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -3423,7 +3422,7 @@ int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema,
     }
 
     if (!(orderByTags || orderByTS)) {
-      setErrMsg(pCmd, msg6, tListLen(msg6));
+      setErrMsg(pCmd, msg6);
       return TSDB_CODE_INVALID_SQL;
     } else {
       assert(!(orderByTags && orderByTS));
@@ -3444,7 +3443,7 @@ int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema,
       SSQLToken cname = {pVar2->nLen, pVar2->nType, pVar2->pz};
       columnIndex = getColumnIndexByName(&cname, pSchema, numOfCols);
       if (columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
-        setErrMsg(pCmd, msg5, tListLen(msg5));
+        setErrMsg(pCmd, msg5);
         return TSDB_CODE_INVALID_SQL;
       } else {
         pCmd->order.order = pSortorder->a[1].sortOrder;
@@ -3455,12 +3454,12 @@ int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema,
   } else {  // meter query
     int32_t columnIndex = getColumnIndexByName(&columnName, pSchema, numOfCols);
     if (columnIndex <= -1) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
 
     if (columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX && !isTopBottomQuery(pCmd)) {
-      setErrMsg(pCmd, msg5, tListLen(msg5));
+      setErrMsg(pCmd, msg5);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3471,7 +3470,7 @@ int32_t setOrderByClause(SSqlCmd* pCmd, SQuerySQL* pQuerySql, SSchema* pSchema,
 
       pExpr = tscSqlExprGet(pCmd, 1);
       if (pExpr->colInfo.colIdx != columnIndex && columnIndex != PRIMARYKEY_TIMESTAMP_COL_INDEX) {
-        setErrMsg(pCmd, msg, tListLen(msg));
+        setErrMsg(pCmd, msg);
         return TSDB_CODE_INVALID_SQL;
       }
 
@@ -3493,14 +3492,14 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   pCmd->command = TSDB_SQL_ALTER_TABLE;
 
   if (tscValidateName(&(pAlterSQL->name)) != TSDB_CODE_SUCCESS) {
-  	char msg[] = "invalid table name";
-    setErrMsg(pCmd, msg, tListLen(msg));
+  	const char* msg = "invalid table name";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
   if (setMeterID(pSql, &(pAlterSQL->name)) != TSDB_CODE_SUCCESS) {
-    char msg[] = "table name too long";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "table name too long";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3515,18 +3514,18 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   if (pInfo->sqlType == ALTER_TABLE_TAGS_ADD || pInfo->sqlType == ALTER_TABLE_TAGS_DROP ||
       pInfo->sqlType == ALTER_TABLE_TAGS_CHG) {
     if (UTIL_METER_IS_NOMRAL_METER(pCmd)) {
-      char msg[] = "manipulation of tag available for metric";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "manipulation of tag available for metric";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
   } else if ((pInfo->sqlType == ALTER_TABLE_TAGS_SET) && (UTIL_METER_IS_METRIC(pCmd))) {
-    char msg[] = "set tag value only available for table";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "set tag value only available for table";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   } else if ((pInfo->sqlType == ALTER_TABLE_ADD_COLUMN || pInfo->sqlType == ALTER_TABLE_DROP_COLUMN) &&
              UTIL_METER_IS_CREATE_FROM_METRIC(pCmd)) {
-    char msg[] = "column can only be modified by metric";
-    setErrMsg(pCmd, msg, tListLen(msg));
+    const char* msg = "column can only be modified by metric";
+    setErrMsg(pCmd, msg);
     return TSDB_CODE_INVALID_SQL;
   }
 
@@ -3535,8 +3534,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     tFieldList* pFieldList = pAlterSQL->pAddColumns;
     if (pFieldList->nField > 1) {
-      char msg[] = "only support add one tag";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "only support add one tag";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3550,26 +3549,26 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   } else if (pInfo->sqlType == ALTER_TABLE_TAGS_DROP) {
     pCmd->count = TSDB_ALTER_TABLE_DROP_TAG_COLUMN;
 
-    char msg1[] = "no tags can be dropped";
-    char msg2[] = "only support one tag";
-    char msg3[] = "tag name too long";
-    char msg4[] = "illegal tag name";
-    char msg5[] = "primary tag cannot be dropped";
+    const char* msg1 = "no tags can be dropped";
+    const char* msg2 = "only support one tag";
+    const char* msg3 = "tag name too long";
+    const char* msg4 = "illegal tag name";
+    const char* msg5 = "primary tag cannot be dropped";
 
     if (pMeterMeta->numOfTags == 1) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
 
     // numOfTags == 1
     if (pAlterSQL->varList->nExpr > 1) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
 
     tVariantListItem* pItem = &pAlterSQL->varList->a[0];
     if (pItem->pVar.nLen > TSDB_COL_NAME_LEN) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3586,10 +3585,10 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     if (idx == -1) {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return TSDB_CODE_INVALID_SQL;
     } else if (idx == 0) {
-      setErrMsg(pCmd, msg5, tListLen(msg5));
+      setErrMsg(pCmd, msg5);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3600,8 +3599,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     pCmd->numOfCols = 1;  // only one column
 
   } else if (pInfo->sqlType == ALTER_TABLE_TAGS_CHG) {
-    char msg1[] = "tag name too long";
-    char msg2[] = "invalid tag name";
+    const char* msg1 = "tag name too long";
+    const char* msg2 = "invalid tag name";
 
     pCmd->count = TSDB_ALTER_TABLE_CHANGE_TAG_COLUMN;
     tVariantList* pVarList = pAlterSQL->varList;
@@ -3613,12 +3612,12 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     tVariantListItem* pDstItem = &pAlterSQL->varList->a[1];
 
     if (pSrcItem->pVar.nLen >= TSDB_COL_NAME_LEN || pDstItem->pVar.nLen >= TSDB_COL_NAME_LEN) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
 
     if (pSrcItem->pVar.nType != TSDB_DATA_TYPE_BINARY || pDstItem->pVar.nType != TSDB_DATA_TYPE_BINARY) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3640,8 +3639,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     if ((!srcFound) || dstFound) {
-      char msg[] = "invalid tag name";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "invalid tag name";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3665,8 +3664,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     tVariant*     pTagName = &pVarList->a[0].pVar;
 
     if (pTagName->nLen > TSDB_COL_NAME_LEN) {
-      char msg[] = "tag name too long";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "tag name too long";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3683,16 +3682,16 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     if (tagsIndex == -1) {
-      char msg[] = "invalid tag name";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "invalid tag name";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
     // validate the length of binary
     if (pTagsSchema[tagsIndex].type == TSDB_DATA_TYPE_BINARY &&
         pVarList->a[1].pVar.nLen > pTagsSchema[tagsIndex].bytes) {
-      char msg[] = "tag value too long";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "tag value too long";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3706,8 +3705,8 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     tFieldList* pFieldList = pAlterSQL->pAddColumns;
     if (pFieldList->nField > 1) {
-      char msg[] = "only support add one column";
-      setErrMsg(pCmd, msg, tListLen(msg));
+      const char* msg = "only support add one column";
+      setErrMsg(pCmd, msg);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3721,25 +3720,25 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   } else if (pInfo->sqlType == ALTER_TABLE_DROP_COLUMN) {
     pCmd->count = TSDB_ALTER_TABLE_DROP_COLUMN;
 
-    char msg1[] = "no columns can be dropped";
-    char msg2[] = "only support one column";
-    char msg3[] = "column name too long";
-    char msg4[] = "illegal column name";
-    char msg5[] = "primary timestamp column cannot be dropped";
+    const char* msg1 = "no columns can be dropped";
+    const char* msg2 = "only support one column";
+    const char* msg3 = "column name too long";
+    const char* msg4 = "illegal column name";
+    const char* msg5 = "primary timestamp column cannot be dropped";
 
     if (pMeterMeta->numOfColumns == TSDB_MIN_COLUMNS) {  //
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
 
     if (pAlterSQL->varList->nExpr > 1) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
 
     tVariantListItem* pItem = &pAlterSQL->varList->a[0];
     if (pItem->pVar.nLen > TSDB_COL_NAME_LEN) {
-      setErrMsg(pCmd, msg3, tListLen(msg3));
+      setErrMsg(pCmd, msg3);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3755,10 +3754,10 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     if (idx == -1) {
-      setErrMsg(pCmd, msg4, tListLen(msg4));
+      setErrMsg(pCmd, msg4);
       return TSDB_CODE_INVALID_SQL;
     } else if (idx == 0) {
-      setErrMsg(pCmd, msg5, tListLen(msg5));
+      setErrMsg(pCmd, msg5);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3773,18 +3772,18 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 }
 
 int32_t validateSqlFunctionInStreamSql(SSqlCmd* pCmd) {
-  char msg0[] = "sample interval can not be less than 10ms.";
-  char msg1[] = "functions not allowed in select clause";
+  const char* msg0 = "sample interval can not be less than 10ms.";
+  const char* msg1 = "functions not allowed in select clause";
 
   if (pCmd->nAggTimeInterval != 0 && pCmd->nAggTimeInterval < 10) {
-    setErrMsg(pCmd, msg0, tListLen(msg0));
+    setErrMsg(pCmd, msg0);
     return TSDB_CODE_INVALID_SQL;
   }
 
   for (int32_t i = 0; i < pCmd->fieldsInfo.numOfOutputCols; ++i) {
     int32_t functId = tscSqlExprGet(pCmd, i)->sqlFuncId;
     if (!IS_STREAM_QUERY_VALID(aAggs[functId].nStatus)) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -3794,7 +3793,7 @@ int32_t validateSqlFunctionInStreamSql(SSqlCmd* pCmd) {
 
 int32_t validateFunctionsInIntervalOrGroupbyQuery(SSqlCmd* pCmd) {
   bool isProjectionFunction = false;
-  char msg[] = "column projection is not compatible with interval";
+  const char* msg = "column projection is not compatible with interval";
 
   // multi-output set/ todo refactor
   for (int32_t k = 0; k < pCmd->fieldsInfo.numOfOutputCols; ++k) {
@@ -3805,7 +3804,7 @@ int32_t validateFunctionsInIntervalOrGroupbyQuery(SSqlCmd* pCmd) {
     }
   }
   if (pCmd->metricQuery == 0 || isProjectionFunction == true) {
-    setErrMsg(pCmd, msg, tListLen(msg));
+    setErrMsg(pCmd, msg);
   }
 
   return isProjectionFunction == true ? TSDB_CODE_INVALID_SQL : TSDB_CODE_SUCCESS;
@@ -3906,10 +3905,10 @@ int32_t setLimitOffsetValueInfo(SSqlObj* pSql, SQuerySQL* pQuerySql) {
   SSqlCmd* pCmd = &pSql->cmd;
   bool     isMetric = UTIL_METER_IS_METRIC(pCmd);
 
-  char msg0[] = "soffset can not be less than 0";
-  char msg1[] = "offset can not be less than 0";
-  char msg2[] = "slimit/soffset only available for STable query";
-  char msg3[] = "function not supported on table";
+  const char* msg0 = "soffset can not be less than 0";
+  const char* msg1 = "offset can not be less than 0";
+  const char* msg2 = "slimit/soffset only available for STable query";
+  const char* msg3 = "function not supported on table";
 
   // handle the limit offset value, validate the limit
   pCmd->limit = pQuerySql->limit;
@@ -3933,7 +3932,7 @@ int32_t setLimitOffsetValueInfo(SSqlObj* pSql, SQuerySQL* pQuerySql) {
     }
 
     if (pCmd->glimit.offset < 0) {
-      setErrMsg(pCmd, msg0, tListLen(msg0));
+      setErrMsg(pCmd, msg0);
       return TSDB_CODE_INVALID_SQL;
     }
 
@@ -3962,14 +3961,14 @@ int32_t setLimitOffsetValueInfo(SSqlObj* pSql, SQuerySQL* pQuerySql) {
     pCmd->globalLimit = pCmd->limit.limit;
   } else {
     if (pCmd->glimit.limit != -1 || pCmd->glimit.offset != 0) {
-      setErrMsg(pCmd, msg2, tListLen(msg2));
+      setErrMsg(pCmd, msg2);
       return TSDB_CODE_INVALID_SQL;
     }
 
     for (int32_t i = 0; i < pCmd->fieldsInfo.numOfOutputCols; ++i) {
       SSqlExpr* pExpr = tscSqlExprGet(pCmd, i);
       if (pExpr->colInfo.colIdx == -1) {
-        setErrMsg(pCmd, msg3, tListLen(msg3));
+        setErrMsg(pCmd, msg3);
         return TSDB_CODE_INVALID_SQL;
       }
     }
@@ -3980,7 +3979,7 @@ int32_t setLimitOffsetValueInfo(SSqlObj* pSql, SQuerySQL* pQuerySql) {
     }
 
     if (pCmd->limit.offset < 0) {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }
@@ -4009,8 +4008,8 @@ static void setCreateDBOption(SCreateDbMsg* pMsg, SCreateDBInfo* pCreateDb) {
 }
 
 int32_t parseCreateDBOptions(SCreateDBInfo* pCreateDbSql, SSqlCmd* pCmd) {
-  char msg0[] = "invalid number of options";
-  char msg1[] = "invalid time precision";
+  const char* msg0 = "invalid number of options";
+  const char* msg1 = "invalid time precision";
 
   SCreateDbMsg *pMsg = (SCreateDbMsg *) (pCmd->payload + tsRpcHeadSize + sizeof(SMgmtHead));
   setCreateDBOption(pMsg, pCreateDbSql);
@@ -4032,7 +4031,7 @@ int32_t parseCreateDBOptions(SCreateDBInfo* pCreateDbSql, SSqlCmd* pCmd) {
         break;
       }
       default: {
-        setErrMsg(pCmd, msg0, tListLen(msg0));
+        setErrMsg(pCmd, msg0);
         return TSDB_CODE_INVALID_SQL;
       }
     }
@@ -4050,7 +4049,7 @@ int32_t parseCreateDBOptions(SCreateDBInfo* pCreateDbSql, SSqlCmd* pCmd) {
         strlen(TSDB_TIME_PRECISION_MICRO_STR) == pToken->n) {
       pMsg->precision = TSDB_TIME_PRECISION_MICRO;
     } else {
-      setErrMsg(pCmd, msg1, tListLen(msg1));
+      setErrMsg(pCmd, msg1);
       return TSDB_CODE_INVALID_SQL;
     }
   }