fix error in sort logic

source/libs/executor/inc/tsort.h

@@ -50,7 +50,6 @@ typedef struct SMsortComparParam {
   void        **pSources;
   int32_t       numOfSources;
   SArray       *orderInfo;   // SArray<SBlockOrderInfo>
-  bool          nullFirst;
 } SMsortComparParam;
 
 typedef struct SSortHandle SSortHandle;

source/libs/executor/src/executorimpl.c

@@ -4144,6 +4144,7 @@ int32_t loadRemoteDataCallback(void* param, const SDataBuf* pMsg, int32_t code)
 
   pSourceDataInfo->status = EX_SOURCE_DATA_READY;
   tsem_post(&pSourceDataInfo->pEx->ready);
+  return TSDB_CODE_SUCCESS;
 }
 
 static void destroySendMsgInfo(SMsgSendInfo* pMsgBody) {

source/libs/executor/src/tsort.c

@@ -391,11 +391,11 @@ int32_t msortComparFn(const void *pLeft, const void *pRight, void *param) {
     }
 
     if (rightNull) {
-      return pParam->nullFirst? 1:-1;
+      return pOrder->nullFirst? 1:-1;
     }
 
     if (leftNull) {
-      return pParam->nullFirst? -1:1;
+      return pOrder->nullFirst? -1:1;
     }
 
     void* left1  = colDataGetData(pLeftColInfoData, pLeftSource->src.rowIndex);