fix(query): avoid copy the unassigned column to the destination datablock after filter applied.

source/libs/executor/src/executorimpl.c

@@ -2055,6 +2055,11 @@ void extractQualifiedTupleByFilterResult(SSDataBlock* pBlock, const int8_t* rowR
       SColumnInfoData* pDst = taosArrayGet(px->pDataBlock, i);
       SColumnInfoData* pSrc = taosArrayGet(pBlock->pDataBlock, i);
 
+      // it is a reserved column for scalar function, and no data in this column yet.
+      if (pSrc->pData == NULL) {
+        continue;
+      }
+
       int32_t numOfRows = 0;
       for (int32_t j = 0; j < totalRows; ++j) {
         if (rowRes[j] == 0) {