fix(query): fixed group by col_proj_function des error on client. [TS-1605]

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

@@ -944,8 +944,6 @@ void doInvokeUdf(SUdfInfo* pUdfInfo, SQLFunctionCtx *pCtx, int32_t idx, int32_t
 
 static void doApplyFunctions(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, STimeWindow* pWin, int32_t offset,
                              int32_t forwardStep, TSKEY* tsCol, int32_t numOfTotal, int32_t numOfOutput) {
-  SQueryAttr *pQueryAttr = pRuntimeEnv->pQueryAttr;
-
   for (int32_t k = 0; k < numOfOutput; ++k) {
     bool hasAggregates = pCtx[k].preAggVals.isSet;
 
@@ -956,13 +954,13 @@ static void doApplyFunctions(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx
     // keep it temporarialy
     char* start = pCtx[k].pInput;
 
-    int32_t pos = (QUERY_IS_ASC_QUERY(pQueryAttr)) ? offset : offset - (forwardStep - 1);
+    // deal order by in aAggs.xFunction, not here
     if (pCtx[k].pInput != NULL) {
-      pCtx[k].pInput = (char *)pCtx[k].pInput + pos * pCtx[k].inputBytes;
+      pCtx[k].pInput = (char *)pCtx[k].pInput + offset * pCtx[k].inputBytes;
     }
 
     if (tsCol != NULL) {
-      pCtx[k].ptsList = &tsCol[pos];
+      pCtx[k].ptsList = &tsCol[offset];
     }
 
     // not a whole block involved in query processing, statistics data can not be used