TiDB里不支持这个函数，可以试下这个：
mysql> begin; select @@tidb_current_ts; rollback;
Query OK, 0 rows affected (0.001 sec)
+--------------------+
| @@tidb_current_ts |
+--------------------+
| 434832859614150657 |
+--------------------+
1 row in set (0.001 sec)
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