diff --git a/include/libs/qcom/query.h b/include/libs/qcom/query.h
index 877cfb130c3b338d701571c945d4b9b53db6bd91..86b51dbb85a70cb95d21ecebcbfa6598fed8bab3 100644
--- a/include/libs/qcom/query.h
+++ b/include/libs/qcom/query.h
@@ -88,12 +88,27 @@ typedef struct SUseDbOutput {
 typedef struct STableMetaOutput {
   int32_t     metaNum;
   char        ctbFname[TSDB_TABLE_FNAME_LEN];
-  char        tbFname[TSDB_TABLE_FNAME_LEN];  
+  char        tbFname[TSDB_TABLE_FNAME_LEN];
   SCTableMeta ctbMeta;
   STableMeta *tbMeta;
 } STableMetaOutput;
 
-typedef int32_t __async_exec_fn_t(void* param);
+typedef struct SDataBuf {
+  void     *pData;
+  uint32_t  len;
+} SDataBuf;
+
+typedef int32_t (*__async_send_cb_fn_t)(void* param, const SDataBuf* pMsg, int32_t code);
+typedef int32_t (*__async_exec_fn_t)(void* param);
+
+typedef struct SMsgSendInfo {
+  __async_send_cb_fn_t fp;        //async callback function
+  void     *param;
+  uint64_t  requestId;
+  uint64_t  requestObjRefId;
+  int32_t   msgType;
+  SDataBuf  msgInfo;
+} SMsgSendInfo;
 
 bool tIsValidSchema(struct SSchema* pSchema, int32_t numOfCols, int32_t numOfTags);
 
@@ -109,7 +124,9 @@ int32_t cleanupTaskQueue();
  */
 int32_t taosAsyncExec(__async_exec_fn_t execFn, void* execParam, int32_t* code);
 
-SSchema* tGetTbnameColumnSchema();
+int32_t asyncSendMsgToServer(void *pTransporter, SEpSet* epSet, int64_t* pTransporterId, const SMsgSendInfo* pInfo);
+
+const SSchema* tGetTbnameColumnSchema();
 void initQueryModuleMsgHandle();
 
 extern int32_t (*queryBuildMsg[TSDB_MSG_TYPE_MAX])(void* input, char **msg, int32_t msgSize, int32_t *msgLen);
diff --git a/source/client/inc/clientInt.h b/source/client/inc/clientInt.h
index 550d8c3ecfe96b0268ce739c2a5d146913024a21..eba904c0b8ff4a010d4265828b1a3c932e1e0c7f 100644
--- a/source/client/inc/clientInt.h
+++ b/source/client/inc/clientInt.h
@@ -29,6 +29,7 @@ extern "C" {
 #include "tlist.h"
 #include "tmsgtype.h"
 #include "trpc.h"
+#include "query.h"
 
 typedef struct SQueryExecMetric {
   int64_t      start;    // start timestamp
@@ -100,11 +101,6 @@ typedef struct SReqResultInfo {
   uint32_t     current;
 } SReqResultInfo;
 
-typedef struct SDataBuf {
-  void     *pData;
-  uint32_t  len;
-} SDataBuf;
-
 typedef struct SRequestSendRecvBody {
   tsem_t          rspSem;        // not used now
   void*           fp;
@@ -119,39 +115,21 @@ typedef struct SRequestObj {
   uint64_t         requestId;
   int32_t          type;   // request type
   STscObj         *pTscObj;
-  SQueryExecMetric metric;
   char            *sqlstr;  // sql string
-  SRequestSendRecvBody body;
   int64_t          self;
   char            *msgBuf;
   void            *pInfo;   // sql parse info, generated by parser module
   int32_t          code;
+  SQueryExecMetric metric;
+  SRequestSendRecvBody body;
 } SRequestObj;
 
-typedef struct SRequestMsgBody {
-  int32_t     msgType;
-  SDataBuf    msgInfo;
-  uint64_t    requestId;
-  uint64_t    requestObjRefId;
-} SRequestMsgBody;
-
-typedef int (*__async_send_cb_fn_t)(void* param, const SDataBuf* pMsg, int32_t code);
-
-typedef struct SMsgSendInfo {
-  __async_send_cb_fn_t    fp;
-  void    *param;
-  uint64_t requestId;
-  uint64_t requestObjRefId;
-  int32_t  msgType;
-  SDataBuf msgInfo;
-} SMsgSendInfo;
-
 extern SAppInfo appInfo;
-extern int32_t  msgObjRefPool;
+extern int32_t  clientReqRefPool;
 extern int32_t  clientConnRefPool;
 
 SMsgSendInfo* buildSendMsgInfoImpl(SRequestObj *pRequest);
-int genericExecCallback(void* param, const SDataBuf* pMsg, int32_t code);
+int genericRspCallback(void* param, const SDataBuf* pMsg, int32_t code);
 extern int (*handleRequestRspFp[TSDB_MSG_TYPE_MAX])(void* param, const SDataBuf* pMsg, int32_t code);
 
 int   taos_init();
@@ -166,7 +144,7 @@ char *getConnectionDB(STscObj* pObj);
 void  setConnectionDB(STscObj* pTscObj, const char* db);
 
 void taos_init_imp(void);
-int taos_options_imp(TSDB_OPTION option, const char *str);
+int  taos_options_imp(TSDB_OPTION option, const char *str);
 
 void* openTransporter(const char *user, const char *auth, int32_t numOfThreads);
 
@@ -176,8 +154,8 @@ void initMsgHandleFp();
 TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass, const char *auth, const char *db, uint16_t port);
 TAOS_RES *taos_query_l(TAOS *taos, const char *sql, int sqlLen);
 
-void* doFetchRow(SRequestObj* pRequest);
-void setResultDataPtr(SReqResultInfo* pResultInfo, TAOS_FIELD* pFields, int32_t numOfCols, int32_t numOfRows);
+void *doFetchRow(SRequestObj* pRequest);
+void  setResultDataPtr(SReqResultInfo* pResultInfo, TAOS_FIELD* pFields, int32_t numOfCols, int32_t numOfRows);
 
 #ifdef __cplusplus
 }
diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index dca4d85ad6c707f16ff31d66fde4d4adc1959b13..7fcdafaf442b33e33821627a343e8266f9e9e27c 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -32,7 +32,7 @@
 #define TSC_VAR_RELEASED    0
 
 SAppInfo   appInfo;
-int32_t    msgObjRefPool  = -1;
+int32_t    clientReqRefPool  = -1;
 int32_t    clientConnRefPool = -1;
 
 static pthread_once_t tscinit = PTHREAD_ONCE_INIT;
@@ -43,7 +43,7 @@ static void registerRequest(SRequestObj* pRequest) {
   assert(pTscObj != NULL);
 
   // connection has been released already, abort creating request.
-  pRequest->self = taosAddRef(msgObjRefPool, pRequest);
+  pRequest->self = taosAddRef(clientReqRefPool, pRequest);
 
   int32_t num = atomic_add_fetch_32(&pTscObj->numOfReqs, 1);
 
@@ -167,12 +167,11 @@ void* createRequest(STscObj* pObj, __taos_async_fn_t fp, void* param, int32_t ty
 
   // TODO generated request uuid
   pRequest->requestId  = 0;
-
   pRequest->metric.start = taosGetTimestampMs();
 
   pRequest->type       = type;
   pRequest->pTscObj    = pObj;
-  pRequest->body.fp    = fp;
+  pRequest->body.fp    = fp;    // not used it yet
   pRequest->msgBuf     = calloc(1, ERROR_MSG_BUF_DEFAULT_SIZE);
   tsem_init(&pRequest->body.rspSem, 0, 0);
 
@@ -201,7 +200,7 @@ void destroyRequest(SRequestObj* pRequest) {
     return;
   }
 
-  taosReleaseRef(msgObjRefPool, pRequest->self);
+  taosReleaseRef(clientReqRefPool, pRequest->self);
 }
 
 void taos_init_imp(void) {
@@ -238,7 +237,7 @@ void taos_init_imp(void) {
   initTaskQueue();
 
   clientConnRefPool = taosOpenRef(200, destroyTscObj);
-  msgObjRefPool  = taosOpenRef(40960, doDestroyRequest);
+  clientReqRefPool  = taosOpenRef(40960, doDestroyRequest);
 
   taosGetAppName(appInfo.appName, NULL);
   appInfo.pid       = taosGetPId();
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 7cd8e9d359bc2bf8a2ef331d51ec5a62ff66d2af..ed211e142c4de1ce85ed525aae38af873e8f3564 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -14,8 +14,6 @@ static int32_t initEpSetFromCfg(const char *firstEp, const char *secondEp, SCorE
 static SMsgSendInfo* buildConnectMsg(SRequestObj *pRequest);
 static void destroySendMsgInfo(SMsgSendInfo* pMsgBody);
 
-static int32_t sendMsgToServer(void *pTransporter, SEpSet* epSet, int64_t* pTransporterId, const SMsgSendInfo* pInfo);
-
 static bool stringLengthCheck(const char* str, size_t maxsize) {
   if (str == NULL) {
     return false;
@@ -201,10 +199,10 @@ TAOS_RES *taos_query_l(TAOS *taos, const char *sql, int sqlLen) {
         tstrncpy(ep.fqdn[i], info.epAddr[i].fqdn, tListLen(ep.fqdn[i]));
       }
 
-      sendMsgToServer(pTscObj->pTransporter, &ep, &transporterId, body);
+      asyncSendMsgToServer(pTscObj->pTransporter, &ep, &transporterId, body);
     } else {
       int64_t transporterId = 0;
-      sendMsgToServer(pTscObj->pTransporter, pEpSet, &transporterId, body);
+      asyncSendMsgToServer(pTscObj->pTransporter, pEpSet, &transporterId, body);
     }
 
     tsem_wait(&pRequest->body.rspSem);
@@ -274,7 +272,7 @@ STscObj* taosConnectImpl(const char *ip, const char *user, const char *auth, con
   SMsgSendInfo* body = buildConnectMsg(pRequest);
 
   int64_t transporterId = 0;
-  sendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &transporterId, body);
+  asyncSendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &transporterId, body);
 
   tsem_wait(&pRequest->body.rspSem);
   destroySendMsgInfo(body);
@@ -335,7 +333,7 @@ static void destroySendMsgInfo(SMsgSendInfo* pMsgBody) {
   tfree(pMsgBody);
 }
 
-int32_t sendMsgToServer(void *pTransporter, SEpSet* epSet, int64_t* pTransporterId, const SMsgSendInfo* pInfo) {
+int32_t asyncSendMsgToServer(void *pTransporter, SEpSet* epSet, int64_t* pTransporterId, const SMsgSendInfo* pInfo) {
   char *pMsg = rpcMallocCont(pInfo->msgInfo.len);
   if (NULL == pMsg) {
     tscError("0x%"PRIx64" msg:%s malloc failed", pInfo->requestId, taosMsg[pInfo->msgType]);
@@ -364,7 +362,7 @@ void processMsgFromServer(void* parent, SRpcMsg* pMsg, SEpSet* pEpSet) {
   assert(pMsg->ahandle != NULL);
 
   if (pSendInfo->requestObjRefId != 0) {
-    SRequestObj *pRequest = (SRequestObj *)taosAcquireRef(msgObjRefPool, pSendInfo->requestObjRefId);
+    SRequestObj *pRequest = (SRequestObj *)taosAcquireRef(clientReqRefPool, pSendInfo->requestObjRefId);
     assert(pRequest->self == pSendInfo->requestObjRefId);
 
     pRequest->metric.rsp = taosGetTimestampMs();
@@ -391,7 +389,7 @@ void processMsgFromServer(void* parent, SRpcMsg* pMsg, SEpSet* pEpSet) {
                pRequest->metric.rsp - pRequest->metric.start);
     }
 
-    taosReleaseRef(msgObjRefPool, pSendInfo->requestObjRefId);
+    taosReleaseRef(clientReqRefPool, pSendInfo->requestObjRefId);
   }
 
   SDataBuf buf = {.pData = pMsg->pCont, .len = pMsg->contLen};
@@ -437,7 +435,7 @@ void* doFetchRow(SRequestObj* pRequest) {
 
     int64_t  transporterId = 0;
     STscObj *pTscObj = pRequest->pTscObj;
-    sendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &transporterId, body);
+    asyncSendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &transporterId, body);
 
     tsem_wait(&pRequest->body.rspSem);
     destroySendMsgInfo(body);
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index 44c78076d9b3bd8e452039042af702adceba6930..af85f1b310abbbe0e691b743bfdc929e14e60de8 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -35,8 +35,8 @@ void taos_cleanup(void) {
     return;
   }
 
-  int32_t id = msgObjRefPool;
-  msgObjRefPool = -1;
+  int32_t id = clientReqRefPool;
+  clientReqRefPool = -1;
   taosCloseRef(id);
 
   cleanupTaskQueue();
diff --git a/source/client/src/clientMsgHandler.c b/source/client/src/clientMsgHandler.c
index b18b3ecb51483777072dcbbe7d36e20b3c2b880b..700a7a20cfc3ba1c1a4614782738b2f962e0ab2c 100644
--- a/source/client/src/clientMsgHandler.c
+++ b/source/client/src/clientMsgHandler.c
@@ -22,7 +22,7 @@
 
 int (*handleRequestRspFp[TSDB_MSG_TYPE_MAX])(void*, const SDataBuf* pMsg, int32_t code);
 
-int genericExecCallback(void* param, const SDataBuf* pMsg, int32_t code) {
+int genericRspCallback(void* param, const SDataBuf* pMsg, int32_t code) {
   SRequestObj* pRequest = param;
   pRequest->code = code;
   sem_post(&pRequest->body.rspSem);
@@ -96,7 +96,7 @@ SMsgSendInfo* buildSendMsgInfoImpl(SRequestObj *pRequest) {
     pMsgSendInfo->requestId = pRequest->requestId;
     pMsgSendInfo->param = pRequest;
 
-    pMsgSendInfo->fp = (handleRequestRspFp[pRequest->type] == NULL)? genericExecCallback:handleRequestRspFp[pRequest->type];
+    pMsgSendInfo->fp = (handleRequestRspFp[pRequest->type] == NULL)? genericRspCallback:handleRequestRspFp[pRequest->type];
   }
 
   return pMsgSendInfo;
diff --git a/source/client/test/CMakeLists.txt b/source/client/test/CMakeLists.txt
index a3f2ad88bb6d8fc35e17ec76dd18539655a607fd..6886206363885e5fc8dc53706585d385065b0810 100644
--- a/source/client/test/CMakeLists.txt
+++ b/source/client/test/CMakeLists.txt
@@ -8,7 +8,7 @@ AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
 ADD_EXECUTABLE(clientTest ${SOURCE_LIST})
 TARGET_LINK_LIBRARIES(
         clientTest
-        PUBLIC os util common transport gtest taos
+        PUBLIC os util common transport gtest taos qcom
 )
 
 TARGET_INCLUDE_DIRECTORIES(
diff --git a/source/libs/qcom/src/queryUtil.c b/source/libs/qcom/src/queryUtil.c
index 829f426c9ddf1e2be1d3cab0220188eb1ad0d0c8..df3fa40004a4df3180ea0855e0fa8efbbe4bfdea 100644
--- a/source/libs/qcom/src/queryUtil.c
+++ b/source/libs/qcom/src/queryUtil.c
@@ -14,7 +14,7 @@ static struct SSchema _s = {
     .name = "tbname",
 };
 
-SSchema* tGetTbnameColumnSchema() {
+const SSchema* tGetTbnameColumnSchema() {
   return &_s;
 }
 
@@ -103,7 +103,7 @@ int32_t cleanupTaskQueue() {
 static void execHelper(struct SSchedMsg* pSchedMsg) {
   assert(pSchedMsg != NULL && pSchedMsg->ahandle != NULL);
 
-  __async_exec_fn_t* execFn = (__async_exec_fn_t*) pSchedMsg->ahandle;
+  __async_exec_fn_t execFn = (__async_exec_fn_t) pSchedMsg->ahandle;
   int32_t code = execFn(pSchedMsg->thandle);
   if (code != 0 && pSchedMsg->msg != NULL) {
     *(int32_t*) pSchedMsg->msg = code;
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index 4185b3176c7f531f8ac3664b3aba4550d2874681..8e57f127771cd1b808afe4adf48575e2a1bc0362 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -32,7 +32,7 @@ int32_t schBuildAndSendRequest(void *pRpc, const SEpSet* pMgmtEps, __taos_async_
   buildConnectMsg(pRequest, &body);
 
   int64_t transporterId = 0;
-  sendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &body, &transporterId);
+  asyncSendMsgToServer(pTscObj->pTransporter, &pTscObj->pAppInfo->mgmtEp.epSet, &body, &transporterId);
 
   tsem_wait(&pRequest->body.rspSem);
   destroyConnectMsg(&body);