fix top no header issue

src/client/src/tscSQLParser.c

@@ -2610,6 +2610,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
         SColumnIndex indexTS = {.tableIndex = index.tableIndex, .columnIndex = 0};
         SExprInfo*   pExpr = tscExprAppend(pQueryInfo, TSDB_FUNC_TS_DUMMY, &indexTS, TSDB_DATA_TYPE_TIMESTAMP,
                                          TSDB_KEYSIZE, getNewResColId(pCmd), TSDB_KEYSIZE, false);
+        tstrncpy(pExpr->base.aliasName, aAggs[TSDB_FUNC_TS_DUMMY].name, sizeof(pExpr->base.aliasName));
 
         SColumnList ids = createColumnList(1, 0, 0);
         insertResultField(pQueryInfo, colIndex, &ids, TSDB_KEYSIZE, TSDB_DATA_TYPE_TIMESTAMP, aAggs[TSDB_FUNC_TS_DUMMY].name, pExpr);