feat(stream): adjust print log

source/common/src/tdatablock.c

@@ -1747,7 +1747,7 @@ char* dumpBlockData(SSDataBlock* pDataBlock, const char* flag, char** pDataBuf)
     for (int32_t k = 0; k < colNum; k++) {
       SColumnInfoData* pColInfoData = taosArrayGet(pDataBlock->pDataBlock, k);
       void*            var = POINTER_SHIFT(pColInfoData->pData, j * pColInfoData->info.bytes);
-      if (colDataIsNull(pColInfoData, rows, j, NULL) || !var) {
+      if (colDataIsNull(pColInfoData, rows, j, NULL) || !pColInfoData->pData) {
         len += snprintf(dumpBuf + len, size - len, " %15s |", "NULL");
         if (len >= size -1) return dumpBuf;
         continue;