Merge pull request #13821 from taosdata/fix/TS-1605-V26

fix(query): V26 fixed group by col_proj_function des error on client. 

src/query/src/qAggMain.c

@@ -3347,6 +3347,12 @@ static void col_project_function(SQLFunctionCtx *pCtx) {
     memcpy(pCtx->pOutput, pData, (size_t) numOfRows * pCtx->inputBytes);
   } else {
     // DESC
+    if (pCtx->param[0].i64 == 1) {
+      // only output one row, copy first row to output
+      memcpy(pCtx->pOutput, pData, (size_t)pCtx->inputBytes);
+      return ;
+    }
+
     for(int32_t i = 0; i < pCtx->size; ++i) {
       char* dst = pCtx->pOutput + (pCtx->size - 1 - i) * pCtx->inputBytes;
       char* src = pData + i * pCtx->inputBytes;

src/query/src/qExecutor.c

@@ -1713,7 +1713,8 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
       longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_APP_ERROR);
     }
 
-    doApplyFunctions(pRuntimeEnv, pInfo->binfo.pCtx, &w, j - num, num, tsList, pSDataBlock->info.rows, pOperator->numOfOutput);
+    int32_t offset = QUERY_IS_ASC_QUERY(pQueryAttr) ? j - num : j - 1;
+    doApplyFunctions(pRuntimeEnv, pInfo->binfo.pCtx, &w, offset, num, tsList, pSDataBlock->info.rows, pOperator->numOfOutput);
 
     num = 1;
 
@@ -1733,7 +1734,8 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
       if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
         longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_APP_ERROR);
       }
-      doApplyFunctions(pRuntimeEnv, pInfo->binfo.pCtx, &w, pSDataBlock->info.rows - num, num, tsList, pSDataBlock->info.rows, pOperator->numOfOutput);
+      int32_t offset = QUERY_IS_ASC_QUERY(pQueryAttr) ? pSDataBlock->info.rows - num : pSDataBlock->info.rows - 1;
+      doApplyFunctions(pRuntimeEnv, pInfo->binfo.pCtx, &w, offset, num, tsList, pSDataBlock->info.rows, pOperator->numOfOutput);
     }
   }