[TD-5623]<feature>: fixed crash caused by second dnodeFetchQ thread try access

pRuntimeEnv->outputbuf NULL pointer issue

src/query/src/qExecutor.c

@@ -8864,6 +8864,10 @@ bool checkNeedToCompressQueryCol(SQInfo *pQInfo) {
 
   SSDataBlock* pRes = pRuntimeEnv->outputBuf;
 
+  if (GET_NUM_OF_RESULTS(&(pQInfo->runtimeEnv)) <= 0) {
+    return false;
+  }
+
   int32_t numOfRows = pQueryAttr->pExpr2 ? GET_NUM_OF_RESULTS(pRuntimeEnv) : pRes->info.rows;
   int32_t numOfCols = pQueryAttr->pExpr2 ? pQueryAttr->numOfExpr2 : pQueryAttr->numOfOutput;
 

src/query/src/queryMain.c

@@ -357,7 +357,7 @@ int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *co
   }
 
   (*pRsp)->precision = htons(pQueryAttr->precision);
-  (*pRsp)->compressed = checkNeedToCompressQueryCol(pQInfo);
+  (*pRsp)->compressed = (int8_t)checkNeedToCompressQueryCol(pQInfo);
 
   if (GET_NUM_OF_RESULTS(&(pQInfo->runtimeEnv)) > 0 && pQInfo->code == TSDB_CODE_SUCCESS) {
     doDumpQueryResult(pQInfo, (*pRsp)->data, (*pRsp)->compressed, &compLen);