fix(query): check result size before store it.

source/libs/executor/src/executil.c

@@ -1010,7 +1010,10 @@ int32_t getTableList(void* metaHandle, void* pVnode, SScanPhysiNode* pScanNode,
       size_t size = numOfTables * sizeof(uint64_t) + sizeof(int32_t);
       char*  pPayload = taosMemoryMalloc(size);
       *(int32_t*)pPayload = numOfTables;
-      memcpy(pPayload + sizeof(int32_t), taosArrayGet(res, 0), numOfTables * sizeof(uint64_t));
+
+      if (numOfTables > 0) {
+        memcpy(pPayload + sizeof(int32_t), taosArrayGet(res, 0), numOfTables * sizeof(uint64_t));
+      }
 
       metaUidFilterCachePut(metaHandle, pScanNode->suid, context.digest, tListLen(context.digest), pPayload,
           size, 1);