fix(query): multi group by fixed overwrite context by write head len

src/query/src/qExecutor.c

@@ -1627,6 +1627,7 @@ static void buildGroupbyKeyBuf(const SSDataBlock *pSDataBlock, SGroupbyOperatorI
     return;
   }
   *buf = p;
+  p += sizeof(int32_t); 
   for (int32_t i = 0; i < taosArrayGetSize(pInfo->pGroupbyDataInfo); i++) {
     SGroupbyDataInfo *pDataInfo = taosArrayGet(pInfo->pGroupbyDataInfo, i);
 
@@ -1650,7 +1651,7 @@ static void buildGroupbyKeyBuf(const SSDataBlock *pSDataBlock, SGroupbyOperatorI
   }
 
   // calc keyLen and save
-  int32_t keyLen = (p - *buf);
+  int32_t keyLen = (p - *buf) - sizeof(int32_t);
   *(int32_t *)(*buf) = keyLen;
 }
 
@@ -1706,7 +1707,7 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
       setParamForStableStddevByColData(pRuntimeEnv, pInfo->binfo.pCtx, pOperator->numOfOutput, pOperator->pExpr, pInfo);
     }
 
-    int32_t ret = setGroupResultOutputBuf(pRuntimeEnv, &(pInfo->binfo), pOperator->numOfOutput, pInfo->prevData, type, pInfo->totalBytes, item->groupIndex);
+    int32_t ret = setGroupResultOutputBuf(pRuntimeEnv, &(pInfo->binfo), pOperator->numOfOutput, pInfo->prevData, type, *(int32_t *)pInfo->prevData, item->groupIndex);
     if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
       longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_APP_ERROR);
     }