偶发报错parse SQL failed

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在 TiDB 7.5.3试了下，确实会报错

mysql> select 1 INTO @MySqlConnectorSleep;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 1 column 40 near "@MySqlConnectorSleep"
mysql>