ProcessInfo can't get SQL when using go-sql-driver to prepare and execute SQL.

[wshwsh12]

Enhancement

ProcessInfo can't get SQL when using go-sql-driver to prepare and execute SQL.

For example, the Info is NULL when Execute

tidb> show processlist;
+---------------+------+-----------------+------+---------+------+------------+------------------+
| Id            | User | Host            | db   | Command | Time | State      | Info             |
+---------------+------+-----------------+------+---------+------+------------+------------------+
| 2199023255955 | root | 127.0.0.1:36760 | NULL | Query   |    0 | autocommit | show processlist |
| 2199023255957 | root | 127.0.0.1:36770 | test | Execute |    5 | autocommit | NULL             |
+---------------+------+-----------------+------+---------+------+------------+------------------+
2 rows in set (0.001 sec)