fix(query): prepare the buffer before assigning result.

source/common/src/tdatablock.c

@@ -299,7 +299,9 @@ int32_t colDataAssign(SColumnInfoData* pColumnInfoData, const SColumnInfoData* p
     return numOfRows;
   }
 
-  ASSERT(pBlockInfo->capacity >= numOfRows);
+  if (pBlockInfo != NULL) {
+    ASSERT(pBlockInfo->capacity >= numOfRows);
+  }
 
   if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
     memcpy(pColumnInfoData->varmeta.offset, pSource->varmeta.offset, sizeof(int32_t) * numOfRows);

source/libs/scalar/src/scalar.c

@@ -982,7 +982,8 @@ int32_t scalarCalculate(SNode *pNode, SArray *pBlockList, SScalarParam *pDst) {
       sclError("no valid res in hash, node:%p, type:%d", pNode, nodeType(pNode));
       SCL_ERR_JRET(TSDB_CODE_QRY_APP_ERROR);
     }
-    
+
+    colInfoDataEnsureCapacity(pDst->columnData, res->numOfRows);
     colDataAssign(pDst->columnData, res->columnData, res->numOfRows, NULL);
     pDst->numOfRows = res->numOfRows;
     taosHashRemove(ctx.pRes, (void *)&pNode, POINTER_BYTES);