fix:create same sub table

source/dnode/vnode/src/tq/tqSink.c

@@ -619,6 +619,7 @@ void tqSinkToTablePipeline2(SStreamTask* pTask, void* vnode, int64_t ver, void*
                   TD_VID(pVnode), ctbName, suid, mr.me.ctbEntry.suid);
           metaReaderClear(&mr);
           taosMemoryFree(ctbName);
+          continue;
         }
 
         tbData.uid = mr.me.uid;

source/libs/executor/src/groupoperator.c

@@ -996,14 +996,14 @@ void appendCreateTableRow(SStreamState* pState, SExprSupp* pTableSup, SExprSupp*
       memset(tbName, 0, TSDB_TABLE_NAME_LEN);
       int32_t len = 0;
       if (colDataIsNull_s(pTbCol, pDestBlock->info.rows - 1)) {
-        len = TMIN(sizeof(TSDB_DATA_NULL_STR), TSDB_TABLE_NAME_LEN - 1);
-        memcpy(tbName, TSDB_DATA_NULL_STR, len);
+        len = 1;
+        tbName[0] = 0;
       } else {
         void* pData = colDataGetData(pTbCol, pDestBlock->info.rows - 1);
         len = TMIN(varDataLen(pData), TSDB_TABLE_NAME_LEN - 1);
         memcpy(tbName, varDataVal(pData), len);
-      }
         streamStatePutParName(pState, groupId, tbName);
+      }
       memcpy(pTmpBlock->info.parTbName, tbName, len);
       pDestBlock->info.rows--;
     } else {