[td-14288] fix bug in first query.

source/libs/executor/src/executorimpl.c

@@ -2208,7 +2208,7 @@ static SqlFunctionCtx* createSqlFunctionCtx_rv(SExprInfo* pExprInfo, int32_t num
   }
 
   for(int32_t i = 1; i < numOfOutput; ++i) {
-    (*rowCellInfoOffset)[i] = (int32_t)((*rowCellInfoOffset)[i - 1] + sizeof(SResultRowEntryInfo) + pFuncCtx[i].resDataInfo.interBufSize);
+    (*rowCellInfoOffset)[i] = (int32_t)((*rowCellInfoOffset)[i - 1] + sizeof(SResultRowEntryInfo) + pFuncCtx[i - 1].resDataInfo.interBufSize);
   }
 
   setCtxTagColumnInfo(pFuncCtx, numOfOutput);

source/libs/function/src/builtinsimpl.c

@@ -528,11 +528,10 @@ void firstFunction(SqlFunctionCtx *pCtx) {
   char* buf = GET_ROWCELL_INTERBUF(pResInfo);
 
   SInputColumnInfoData* pInput = &pCtx->input;
-
   SColumnInfoData* pInputCol = pInput->pData[0];
 
   // All null data column, return directly.
-  if (pInput->pColumnDataAgg[0]->numOfNull == pInput->totalRows) {
+  if (pInput->colDataAggIsSet && (pInput->pColumnDataAgg[0]->numOfNull == pInput->totalRows)) {
     ASSERT(pInputCol->hasNull == true);
     return;
   }